Microsoft KB Archive/885685

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Article ID: 885685

Article Last Modified on 12/3/2007


APPLIES TO

  • Microsoft Windows Small Business Server 2003 Premium Edition
  • Microsoft Windows Small Business Server 2003 Standard Edition



SUMMARY

You can use the Microsoft Exchange Connector for POP3 Mailboxes service in Microsoft Windows Small Business Server 2003 to download e-mail messages from your Internet service provider (ISP) and to deliver those messages. The POP3 Connector uses the following process to deliver e-mail messages to a user in your organization:

  1. It establishes a connection to the remote POP3 server.
  2. It downloads all the messages for that e-mail account to the Windows Small Business Server-based computer.
  3. It moves those messages to the Simple Mail Transfer Protocol (SMTP) PickUp folder where the messages can be delivered to a user's mailbox.

If you experience e-mail message delivery problems when you use the POP3 Connector, first determine which part or parts of this message delivery process are unsuccessful. After you determine the message delivery stage that is unsuccessful, you can perform specific troubleshooting steps to resolve the message delivery issue.

IN THIS TASK

INTRODUCTION

This article describes how to troubleshoot e-mail download and delivery problems that may occur if you use the POP3 Connector in Windows Small Business Server 2003.

Warning When you troubleshoot POP3 Connector e-mail delivery issues, you can lose e-mail messages. If you cannot find an e-mail message in one of the locations that is described in this article, that message might not be recoverable.

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POP3 Connector overview

When you use the POP3 Connector to retrieve e-mail, the following mail-flow process occurs:

  1. The Connector for POP3 Mailboxes service connects to and logs on to the remote POP3 server.
  2. The Connector for POP3 Mailboxes service downloads e-mail messages and stores them in the following folder:

    %PROGRAMFILES%\Microsoft Windows Small Business Server\\Networking\POP3\Incoming Mail

  3. When all the e-mail has been downloaded from the remote POP3 server, Collaborative Data Objects (CDO) on the Windows Small Business Server-based computer retrieves the e-mail messages from the Incoming Mail folder. The headers of these e-mail messages are modified to indicate that the e-mail messages will be directed to a local Exchange mailbox, and then the e-mail messages are saved to the following folder:

    %PROGRAMFILES%\Exchsrvr\Mailroot\vsi 1\PickUp

  4. If CDO cannot move an e-mail message to the PickUp folder, the e-mail message is put in the following folder instead:

    %PROGRAMFILES%\Microsoft Windows Small Business Server\\Networking\POP3\Failed Mail

  5. If an e-mail message is corrupted, it may not be moved to the Failed Mail folder. In this scenario, the corrupted e-mail message remains in the Incoming Mail folder.
  6. All the e-mail messages that are in the PickUp folder are processed by the local SMTP service and are delivered to the appropriate recipient.

When you use the POP3 Connector to retrieve e-mail messages, those e-mail messages are not processed by any of the following Microsoft Exchange Server 2003 components:

  • Recipient Filtering
  • Sender Filtering
  • Connection Filtering
  • The Intelligent Message Filter add-in

Because the POP3 Connector uses CDO to transfer e-mail messages to the SMTP PickUp folder, these e-mail messages bypass the filtering mechanisms that Exchange 2003 contains.


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Use Outlook Express to verify connectivity to the POP3 server

You can configure Microsoft Outlook Express on the Windows Small Business Server-based computer to retrieve e-mail messages. If you cannot use Outlook Express to retrieve e-mail messages, you will not be able to use the POP3 Connector to retrieve those e-mail messages. To configure Outlook Express, follow these steps:

  1. Click Start, point to All Programs, and then click Outlook Express.
  2. If this is the first time that you have started Outlook Express and if the Outlook Express Internet Connection Wizard starts, go to step 5.
  3. On the Tools menu, click Accounts, and then click the Mail tab.
  4. Click Add, and then click Mail.
  5. In the Display name box, type your name in the format that you want your e-mail recipients to see, and then click Next.
  6. In the E-mail address box, type your e-mail alias, and then click Next.
  7. Leave the POP3 selection in the My incoming mail server is a list, and then type the remote POP3 server's fully qualified domain name in the Incoming mail (POP3, IMAP, or HTTP) server box. For example, type pop.fabrikam.com.
  8. In the Outgoing mail (SMTP) server box, type the fully qualified domain name of your Windows Small Business Server-based computer. For example, type mail.contoso.local.
  9. Click Next, type your POP3 e-mail account name in the Account name box, type the password that you use to access the remote POP3 server in the Password box, click Next, and then click Finish.
  10. Click the account that you just created, and then click Properties.
  11. Click the Advanced tab, click to select the Leave a copy of messages on server check box, and then click OK.
  12. Click Close to quit the Internet Accounts dialog box.
  13. On the Tools menu, point to Send and Receive, and then click the POP3 e-mail account that you just created.

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Configure diagnostic logging for the POP3 Connector

Increase the diagnostic logging level on the POP3 Connector, and then specify an Exchange mailbox to send undeliverable e-mail messages to. After you configure these items, try to use the POP3 Connector to download e-mail messages from the remote POP3 server, and then examine the events that appear in Event Viewer. Search the Microsoft Knowledge Base (KB) to determine whether a known resolution exists for any error events that you see. To search the Knowledge Base, visit the following Microsoft Web site:

http://support.microsoft.com


To configure these items, follow these steps:

  1. Click Start, and then click Server Management.
  2. Expand Advanced Management, and then click POP3 Connector Manager.
  3. In the right pane, click Open POP3 Connector Manager.
  4. Click the Troubleshooting tab, and then click Maximum in the Logging level list.
  5. In the Exchange mailbox list, click a mailbox where you want undeliverable e-mail messages sent to, and then click OK.
  6. Click Yes on the following message that appears:

    Changes to the logging level do not take effect until the Microsoft Connector for POP3 Mailboxes service is restarted. Restarting the service temporarily interrupts the download of mail until the service starts again. To restart the service now, click Yes. Otherwise, click No.

  7. Click Open POP3 Connector Manager, and then click the Scheduling tab.
  8. Click Retrieve Now, and then click OK on the following message that appears:

    The Microsoft Connector for POP3 Mailboxes will now download and deliver e-mail. This may take a few moments.

  9. Click OK.
  10. In the left pane, under Advanced Management, expand Computer Management, expand System Tools, expand Event Viewer, and then click Application.
  11. View the events where POP3 Connector appears in the Source column to determine whether the mail-flow process is completed successfully.

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Troubleshoot the POP3 Connector e-mail delivery process

After you use Outlook Express to confirm the availability of the remote POP3 server, use the event information in the Application log to determine the cause of the unsuccessful e-mail delivery. If you cannot determine the cause, try to determine the part of the POP3 Connector e-mail delivery process that is unsuccessful. The POP3 Connector e-mail delivery process includes the following three main stages:

  • The download process
  • The CDO transfer process
  • The SMTP delivery process

To help determine which stage or stages of e-mail delivery are successful, follow these steps:

  1. Start the Server Management tool. To do this, click Start, and then click Server Management.
  2. Expand Advanced Management, expand Computer Management, expand Services and Applications, and then click Services.
  3. In the right pane, right-click Simple Mail Transfer Protocol (SMTP), and then click Stop.
  4. In the left pane, click POP3 Connector Manager, and then click Open POP3 Connector Manager.
  5. Click the Scheduling tab, click Retrieve Now, and then click OK on the following message that appears:

    The Microsoft Connector for POP3 Mailboxes will now download and deliver e-mail. This may take a few moments.

  6. Click OK.
  7. View the contents of the PickUp folder to determine whether files appear. These files are the e-mail messages that the POP3 Connector retrieves from the remote POP3 server. These files have a .eml file name extension. To view the contents of the PickUp folder, click Start, click Run, type %programfiles%\exchsrvr\mailroot\vsi 1\pickup, and then click OK. Use a text editor, such as Notepad, to open these files. Verify that these files are valid e-mail messages and determine the recipient of each e-mail message.

If e-mail messages appear in the PickUp folder, these e-mail messages have successfully passed through the following two stages of the e-mail delivery process:

  • The download process
  • The CDO transfer process

In this scenario, troubleshoot the third stage of the e-mail delivery process, the SMTP delivery process.

If e-mail messages do not appear in the PickUp folder, e-mail is not successfully passing through the first two stages of the e-mail delivery process. In this scenario, troubleshoot the first stage of the e-mail delivery process, the download process.

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Troubleshoot the download process

The POP3 Connector may not download e-mail messages from the remote POP3 server. To troubleshoot this scenario, follow these steps:

  • Start the Microsoft Connector for POP3 Mailboxes service if it is not already started. To do this, follow these steps:
    1. Start the Server Management tool. To do this, click Start, and then click Server Management.
    2. Expand Advanced Management, expand Computer Management, expand Services and Applications, and then click Services.
    3. In the right pane, click Microsoft Connector for POP3 Mailboxes.
    4. If Started does not appear in the Status column, click Start.
  • Use the Telnet tool to connect to the remote POP3 server to determine whether there are any e-mail messages available to download. To do this, follow these steps:
    1. On the Windows Small Business Server-based computer, click Start, click Run, type cmd, and then click OK.
    2. Type telnet RemoteServerfullyQualifiedDomainName 110, and then press ENTER. For example, type telnet pop.fabrikam.com 110, and then press ENTER. Information that is similar to the following appears: 
      +OK mail-host.fabrikam.com server type and version server ready

      Note This banner may differ depending on the type of POP3 server that you connect to. However, the remote POP3 server should at least return +OK.

      If you cannot connect to the remote server successfully, information that is similar to the following is returned: 

      Connecting to mail-host.fabrikam.com... 
Could not open connection to the host on port 110:
Connect failed.

      If you cannot use the Telnet command to connect to the remote POP3 server, follow these steps:

      1. Verify that you have entered the correct host name or IP address for the remote computer.
      2. Verify that outgoing traffic is permitted on port 110 of the Windows Small Business Server-based computer.
      3. Verify that outgoing traffic is permitted on port 110 on all firewalls or routers that exist between your Windows Small Business Server-based computer and the remote POP3 server.
    3. Type user username, and then press ENTER. (username is the account that you use to access the remote POP3 mailbox.) The remote POP3 server returns the following response: 
      +OK
    4. Type pass password, and then press ENTER where password is the correct password for the remote POP3 mailbox. The remote POP3 server returns information that is similar to the following: 
      +OK User successfully logged on.

      If you specify an incorrect user name or password, the remote POP3 server returns information that is similar to the following: 

      -ERR Logon failure: Unknown user name or bad password.
      In this scenario, verify the user name and the password of the POP3 account. Specify this new account information in the POP3 Connector.
    5. To determine whether this POP3 mailbox contains any e-mail messages, type stat, and then press ENTER. The remote POP3 server returns the following information: 
      +OK <number of messages>   <total size of messages in bytes>

      This output is known as the "drop listing." If there are no e-mail messages available to be downloaded from the remote POP3 server, both the values in the drop listing are zero. For example, the drop listing appears as follows: 

      +OK 0 0

      If the drop listing values are zero and if you expect e-mail messages to exist in this mailbox, follow these steps:

      1. Verify that the e-mail address at the remote POP3 server is correct and that you are accessing the correct mailbox for that e-mail address.
      2. Verify that no other POP3 client also accesses this mailbox. A different POP3 client program might be downloading and removing these e-mail messages before the Windows Small Business Server POP3 Connector can retrieve the e-mail messages.
      3. Disconnect from the Telnet session, and then reconnect several minutes later to determine whether new e-mail messages appear in this mailbox.
    6. Type quit, and then press ENTER to quit the Telnet connection to the remote POP3 server. The remote POP3 server returns a response that is similar to the following: 
      +OK Connection to host lost.

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Troubleshoot the CDO transfer process

The POP3 Connector may download e-mail messages from the remote POP3 server, but these e-mail messages may not be delivered to the user. In this scenario, both the following events may appear in the Application log if you configure diagnostic logging levels to the maximum level:

Event 1 Event Source: POP3 Connector
Event Category: Delivery
Event ID: 1046
Date: date
Time: time
Type: Error
User: N/A
Computer: computername
Description: An error occurred while retrieving messages from the Incoming Mail queue for delivery. The error code is -2147467259.



Event 2 Event Source: POP3 Connector
Event Category: Delivery
Event ID: 1048
Date: date
Time: time
Type: Error
User: N/A
Computer: computername
Description: The delivery process finished with one or more errors.

To troubleshoot a scenario where the POP3 Connector does not deliver e-mail messages successfully, follow these steps:

  1. Start Windows Explorer, and then verify that the Failed Mail folder and the Incoming Mail folder exist in the following location:

    %PROGRAMFILES%\Microsoft Windows Small Business Server\Networking\POP3

    If one or both these folders do not exist, create them. If you create these folders, check to see if this action corrects the issue. If the issue is not resolved, go to step 2.
  2. If files exist in the Incoming Mail folder, follow these steps:
    1. Stop the Microsoft Connector for POP3 Mailboxes service.
    2. Copy all the files from the Incoming Mail folder, and then paste them in the PickUp folder to determine whether the files are delivered to the user. By default, the PickUp folder is located in the following folder:

      %PROGRAMFILES%\Exchsrvr\Mailroot\vsi 1\

    If these e-mail messages are delivered successfully, the SMTP delivery process is functioning correctly. In this scenario, a problem might exist in the CDO delivery process where CDO does not successfully move e-mail messages from the Incoming Mail folder to the PickUp folder. If the e-mail messages are delivered successfully after you copy them to the PickUp folder, start the Microsoft Connector for POP3 Mailboxes service, and then go to step 3.
  3. Re-register the POP3 Connector event sink in Microsoft Internet Information Services (IIS). To do this, click Start, click Run, type %programfiles%\microsoft windows small business server\networking\pop3\imbreg.exe, and then click OK. To determine whether the POP3 Connector event sink has been registered successfully, run the Smtpreg.vbs Event Management Script on the Windows Small Business Server-based computer. To do this, follow these steps:
    1. Visit the following Microsoft Web site:

      smtpreg.vbs Event Management Script

    2. Copy the code that appears on this Web page to a file that is named Smtpreg.vbs. Save this file in the following folder:

      %SYSTEMDRIVE%\InetPub\AdminScripts

    3. Click Start, click Run, type cmd, and then click OK.
    4. Move to the AdminScripts directory.
    5. Type the following command, and then press ENTER:

      cscript smtpreg.vbs /enum > eventsinks.txt

    6. Type notepad eventsinks.txt, and then press ENTER.
    7. Search the Eventsinks.txt file for POP3. If the POP3 Connector event sink is registered, the following POP3 event sink binding information appears in this file: 
       ---------
| Binding |
 ---------
            Event: SMTP Transport OnSubmission
               ID: {66F4180A-627E-4073-8D31-51F628AA8366}
             Name: POP3 Connector Event Sink
        SinkClass: Imbdlvres.IMBDeliveryEventSink
          Enabled: True
 SourceProperties: {
                    rule = RCPT TO=*mspop3connector.*
                    priority = 0
                   }
  4. If the e-mail delivery issue is not resolved after you re-register the POP3 Connector event sink, follow these steps:
    1. Stop the Microsoft Connector for POP3 Mailboxes service.
    2. Move all the files from the Incoming Mail folder to a temporary folder location.
    3. Copy only a few e-mail messages to the Incoming Mail folder, and then start the Microsoft Connector for POP3 Mailboxes service.
    4. Start the Server Management tool, open the POP3 Connector Manager tool, click the Scheduling tab, and then click Retrieve Now.
    5. View the files in the Incoming Mail folder to determine which files are moved to the PickUp folder and which files remain in the Incoming Mail folder. One or more corrupted e-mail messages in the Incoming Mail folder may prevent CDO from moving e-mail messages to the PickUp folder.
    6. If some files remain in the Incoming Mail folder, move those files to another temporary location.
    7. Follow steps c through f to deliver all the mail that CDO can successfully move to the PickUp folder and to remove e-mail messages that CDO cannot move successfully.
    8. For all files that CDO could not successfully move to the PickUp folder, verify the file name extensions. The corrupted e-mail messages might have different file name extensions than the files that were moved to the PickUp folder successfully. A condition may exist where a program, such as an antivirus program, has modified the e-mail message file.

      Additionally, use a text editor, such as Notepad, to try to open these files. Sometimes, you may receive an "Access denied" error when you try to open these files, even if you have the correct ownership or permissions to access these files. If you can view these e-mail messages, you can deliver them to the recipient by attaching the e-mail message to another e-mail message. If you cannot use a text editor to view these e-mail messages, delete them.
  5. If this issue is not resolved, follow these steps:
    1. Rename and replace all the following files on the Windows Small Business Server-based computer with the files from the Windows Small Business Server 2003 CD:
      • %WINDIR%\System32\Inetcomm.dll
      • %WINDIR%\System32\Inetres.dll
      • %WINDIR%\System32\Msdart.dll
      • %WINDIR%\System32\Msoert2.dll
      • %PROGRAMFILES%\Common Files\System\Ole DB\Oledb32.dll
    2. Use the regsvr32 command to register these replaced files. To do this, click Start, click Run, type each one of the following commands, and then click OK:
      • regsvr32 %WINDIR%\System32\Inetcomm.dll
      • regsvr32 %WINDIR%\System32\Inetres.dll
      • regsvr32 %WINDIR%\System32\Msdart.dll
      • regsvr32 %WINDIR%\System32\Msoert2.dll
      • regsvr32 "%PROGRAMFILES%\Common Files\System\Ole DB\Oledb32.dll"
  6. If there are no files in the Incoming Mail folder, follow these steps:
    1. View the contents of the Failed Mail folder. If e-mail messages cannot be moved from the Incoming Mail folder to the PickUp folder, the messages are moved to the Failed Mail folder instead.
    2. If files exist in the Failed Mail folder, use a text editor, such as Notepad, to open these files. Try to determine why each e-mail message could not be delivered. For example, determine whether an e-mail message has a valid e-mail address.

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Troubleshoot the SMTP delivery process

The POP3 Connector may download e-mail messages from the remote POP3 server, but those e-mail messages may not be delivered to the user. In this scenario, no files remain in the Incoming Mail folder or the Failed Mail folder. To troubleshoot this issue, follow these steps:

  1. Examine the contents of the PickUp folder. If no files appear in this folder, Windows tried to deliver the e-mail message to the recipient. At this point, the e-mail message is outside the boundaries of the POP3 Connector. In this scenario, follow these steps:
    1. Examine the SMTP queues on the Windows Small Business Server-based computer. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

      835734 Many unexpected outbound e-mail messages appear in the SMTP queue in Small Business Server 2003

    2. Enable e-mail message tracking on the Windows Small Business Server-based computer. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

      821910 How to troubleshoot for Exchange Server 2003 transport issues

    3. Determine whether recipients exist and whether those recipients can receive internal e-mail messages that are addressed to the user's Internet e-mail address. To do this, send an e-mail message to the user. However, do not select that user from the global address list (GAL). Instead, manually type the user's e-mail address.
    4. View the contents of the Badmail folder to see if it contains any e-mail message. By default, this folder is located in the following folder:

      %PROGRAMFILES%\Exchsrvr\mailroot\vsi 1\Badmail

      Note The Badmail folder is disabled in Microsoft Exchange Server 2003 Service Pack 1 (SP1).
  2. If there are files in the PickUp folder, and if the number of files in this folder continuously increases, verify that the SMTP service is running and verify that the Default SMTP Virtual Server is started. To do this, follow these steps:
    1. In the Server Management tool, expand Advanced Management, expand Computer Management, expand Services and Applications, and then click Services.
    2. If the Simple Mail Transfer Protocol (SMTP) service is not running, right-click Simple Mail Transfer Protocol (SMTP), and then click Start.
    3. In the Server Management tool under Advanced Management, expand SBS (Exchange), expand Servers, expand your server, expand Protocols, and then expand SMTP.
    4. Right-click Default SMTP Virtual Server, and then click Start.

      Note If the Start command is not available, the SMTP Virtual Server is already started.
  3. View the properties of the user account that does not receive e-mail messages to determine whether this account is configured to forward e-mail messages to another user. If the affected user account is configured to forward e-mail messages to another user, but the account is not also configured to retain a copy of the e-mail message, the e-mail messages will not appear in the affected user's mailbox on the Windows Small Business Server-based computer. To verify this information, follow these steps:
    1. In the Server Management tool, expand Advanced Management, expand your domain, expand MyBusiness, expand Users, expand SBSUsers, right-click the affected user, and then click Properties.

      Note If the user account is in a container other than the SBSUsers organizational unit, modify this step accordingly.
    2. Click the Exchange General tab, and then click Delivery Options.
    3. Under Forwarding address, determine whether the Forward to option is selected. If the Forward to option is selected, but the Deliver messages to both forwarding address and mailbox check box is not also selected, both the following behaviors occur:
      • E-mail messages are delivered to the forwarding e-mail address.
      • E-mail messages are not retained in the user's mailbox.
    4. Click OK two times.
  4. Determine whether the affected user's mailbox has exceeded the mailbox quota that is defined for the mailbox store on the Windows Small Business Server-based computer. By default, in Windows Small Business Server 2003, a user cannot send or receive e-mail messages if their mailbox size reaches 200,000 kilobytes (KB). To view the size of the user's mailbox, follow these steps:
    1. In the Server Management tool, expand Advanced Management, expand SBS (Exchange), expand Servers, expand your server, expand First Storage Group, expand Mailbox Store (ServerName), and then click Mailboxes.
    2. In the right pane, view the user's mailbox to determine the mailbox size.

    If the user's mailbox is full, remove some items from that user's mailbox. For example, use Outlook to empty the Deleted Items folder. Alternatively, you can configure this user account to override the default mailbox quota settings. To do this, follow these steps:

    1. In the Server Management tool, expand Advanced Management, expand your domain, expand MyBusiness, expand Users, expand SBSUsers, right-click the affected user, and then click Properties.

      Note If the user account is in a container other than the SBSUsers organizational unit, modify this step accordingly.
    2. Click the Exchange General tab, and then click Storage Limits.
    3. Under Storage limits, click to clear the Use mailbox store defaults check box. If you want to define limits for this mailbox, click to select one or more of the following check boxes, and then type the mailbox limits that you want to define:

      Issue warning at (KB)
      Prohibit send at (KB)
      Prohibit send and receive at (KB)

    4. Click OK two times.

    To modify the mailbox store limits for all users in your Exchange environment, follow these steps:

    1. In the Server Management tool, expand Advanced Management, expand SBS (Exchange), expand Servers, expand your server, expand First Storage Group, right-click Mailbox Store (ServerName), and then click Properties.
    2. Click the Limits tab, and then modify the values that appear in both the following boxes:

      Issue warning at (KB)
      Prohibit send and receive at (KB)

    3. Click OK, and then restart the Microsoft Exchange Information Store service.
  5. Verify that your default recipient policy contains the correct e-mail domain. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

    842293 Event 1070 is logged and e-mail messages are not delivered with the SBS 2003 Connector for PO842293 Mailboxes

  6. Determine whether any rules exist in the affected user's Outlook client program. A rule might be defined to automatically move e-mail messages when they arrive in the user's mailbox. To view the rules in Outlook, click Rules and Alerts on the Tools menu.

  7. Determine whether anonymous access has been disabled on the default SMTP Virtual Server on the Windows Small Business Server-based computer. If anonymous access has been disabled and if you configure the POP3 Connector diagnostic logging to the maximum level, the following event may be logged in the Application log in Event Viewer:

    Event Source: POP3 Connector
    Event Category: Download
    Event ID: 12052
    Date: date
    Time: time
    Type: Error
    User: N/A
    Computer: computername
    Description: POP3: An error occurred during a POP3 Transaction to host name of remote POP3 server for user username. The error is 86.

    To enable anonymous access on the default SMTP Virtual Server, follow these steps:

    1. In the Server Management tool, expand Advanced Management, expand SBS (Exchange), expand Servers, expand your server, expand Protocols, right-click Mailbox Store (ServerName), and then expand SMTP.
    2. Right-click Default SMTP Virtual Server, and then click Properties.
    3. Click the Access tab, and then click Authentication.
    4. Click to select the Anonymous access check box, and then click OK two times.
  8. Make sure that an antivirus program is not scanning the PickUp folder on the Windows Small Business Server-based computer. You must exclude the Mailroot folder and all its subfolders from antivirus scanning.

    For more information, click the following article number to view the article in the Microsoft Knowledge Base:

    823166 Overview of Exchange Server 2003 and antivirus software


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REFERENCES

For additional information about POP3, see the following RFC documents:

RFC 1725
RFC 1734
RFC 1939


To do this, visit the following Internet Engineering Task Force (IETF) Web site:

http://www.ietf.org/rfc/



For more information, click the following article number to view the article in the Microsoft Knowledge Base:

262986 Exchange Server RFC and standards compliance


Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

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