IMAP4 clients may experience latencies or slowness when the clients are running against Exchange Server 2007-based servers

In Microsoft Exchange Server 2007, IMAP4 clients may experience latencies or slowness when the clients are running against Exchange Server 2007-based servers.

For example, users who use IMAP4 clients may experience intermittent slow downloads of e-mail message headers and of e-mail message bodies.

To resolve this problem in Exchange Server 2007 Service Pack 1, install Update Rollup 1 for Exchange Server 2007 Service Pack 1. For more information about Update Rollup 1 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: To resolve this problem in the release version of Exchange Server 2007, install Update Rollup 6 for Exchange Server 2007. For more information about Update Rollup 6 for Exchange Server 2007, see the following Exchange Help topic: For more information about how to install the latest Exchange service pack or update rollup, see the following Exchange Help topic:

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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