Microsoft KB Archive/826295

= You cannot open more than 256 mailboxes by using WebDAV in Exchange Server 2003 =

Article ID: 826295

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange Server 2003 Standard Edition
 * Microsoft Exchange Server 2003 Enterprise Edition

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SYMPTOMS
When you create a program or a script to open many mailboxes by using Web Distributed Authoring and Versioning (WebDAV) in Microsoft Exchange Server 2003, you experience the following symptoms:
 * The first 256 mailboxes are opened successfully.
 * The program or script that you have configured to open mailboxes receives an HTTP 500 error message from the Internet Information Services (IIS) computer for each mailbox that it tries to open after the first 256 mailboxes have been opened.



CAUSE
This problem occurs because each WebDAV client logon shares a single session. The WebDAV session pool code does not look beyond the first session in its free list when it searches for a session to use. Because there is a limit of 256 sequential logons in a single session, you experience this problem when you try to open more than 256 mailboxes.



Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Exchange Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;[LN;CNTACTMS]

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
No prerequisites are required to install this hotfix.

Restart requirement
You do not have to restart your computer after you install this hotfix. However, all the following services are automatically stopped and then restarted when you install this hotfix:
 * MSExchangeIS
 * W3SVC
 * SMTPSVC
 * RESvc
 * POP3Svc
 * NntpSvc
 * IMAP4Svc
 * HTTPFilter
 * iisadmin

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time   Version            Size    File name --  10-Jul-2003  21:42  6.5.6980.10     1,063,424  Davex.dll 10-Jul-2003 21:46  6.5.6980.10     3,618,816  Excdo.dll 10-Jul-2003 21:42  6.5.6980.10     2,536,448  Exoledb.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

817903 XADM: New naming schema for Exchange Server software update packages

Additional query words: XADM

Keywords: kbhotfixserver kbqfe kbqfe kbfix kbbug kbexchange2003presp1fix KB826295

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