Microsoft KB Archive/197636

= The difference between e-mail storage standard of an IMAP Server and other e-mail protocols in Outlook 2000 installed with Internet Mail Only (IMO) =

Article ID: 197636

Article Last Modified on 8/11/2004

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APPLIES TO


 * Microsoft Outlook 2000 Standard Edition

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This article was previously published under Q197636



NOTE: These procedures only apply if you have installed Outlook with the Internet Mail Only option. To determine your installation type, click About Microsoft Outlook on the Help menu. If you have the Internet Mail Only option installed, you see "Internet Mail Only".

For information about the differences between Microsoft Outlook and Microsoft Outlook Express e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base:

257824 OL2000: Differences Between Outlook and Outlook Express



SUMMARY
Microsoft Outlook 2000 supports the Internet Mail Access Protocol 4 (IMAP). This open Internet e-mail standard uses server-based mail storage. Because its storage is server-based, there are differences between it and other e-mail protocols. The following are the major differences.



No Non-Mail Folders Can Be Stored on an IMAP Server
Due to limitations of the IMAP protocol, as well as for efficiency and interoperability concerns, Outlook does not allow non-mail folder storage on an IMAP server.

No Mail "Special Folder" Can Be Stored on the IMAP Server
Your Sent Items, Drafts, and Deleted Items folders cannot reside on an IMAP server. Outlook requires that all special folders exist in the default store. IMAP cannot act as the default store because it cannot contain the non-mail special folders.

You can simulate a server-side Sent Items folder by creating a rule in Rules Wizard that copies all outgoing mail to the IMAP folder of your choice. There is no workaround for Drafts and Deleted Items.

Different Deletion Model
Deletion works through marking items for deletion and then purging all items marked for deletion in a given folder. There is no Deleted Items folder because moving an item in IMAP is inefficient; the source item is not immediately deleted due to the two-phase deletion model. This requires that you double the storage requirement for that message.

Unable to Start Outlook in the IMAP Inbox
Even if you use only IMAP accounts, or your IMAP account is set as your default mail account, Outlook will still launch into a POP3 inbox, the Inbox of your default store. This is because IMAP cannot act as the default store.

As a possible workaround, you can create a shortcut to the Inbox of the IMAP store on your desktop, and start Outlook from this shortcut.

Outlook Today Does Not Display Information for Your IMAP Inbox
Even if you use only IMAP accounts, or your IMAP account is set as your default mail account, Outlook Today will only show the unread count from your POP3 Inbox, the Inbox of your default store. This is because IMAP cannot act as the default store.

New Mail Notifications
You will get a new mail notification only if you have a persistent connection to the IMAP server. If you are using a dial-up connection to retrieve e-mail from the IMAP store, you will not receive a sound, the pointer will not change briefly, and the envelope icon will not appear in the system tray.

Net Folders Do Not Function with IMAP
The Net Folders component depends upon the Rules Wizard and therefore will not function when used with an IMAP mail server.

Contact Linking Does not Function with IMAP
In Outlook, Contacts can contain activity information such as mail received from a particular contact. This type of activity tracking cannot be linked to an IMAP store. To work around this, use the Rules Wizard to create a rule that moves all incoming mail from the IMAP inbox to the inbox of the Personal Folder. Activity tracking can then be based on this Inbox.

