If a folder name
for a Microsoft Exchange Server 2007 mailbox contains many asterisk characters (*) or percent characters (%), certain IMAP
commands may cause the CPU usage to increase to 100 percent on an Exchange 2007 server that
is running the Client Access Server (CAS) role. Additionally, if you use Windows Task Manager to verify the problem, you find that the
Microsoft.Exchange.Imap4.exe process causes the high CPU usage.
When this problem
occurs, the high CPU usage affects other users who access their
mailboxes through the Exchange 2007 server that is running the CAS role. If you restart Microsoft Exchange IMAP4
service, the problem is resolved temporarily. However, the problem may occur
again.
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To resolve this problem, install Update Rollup 5 for Exchange Server 2007.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
941421 (http://support.microsoft.com/kb/941421/)
Description of Update Rollup 5 for Exchange Server 2007
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Microsoft
has confirmed that this is a problem in the Microsoft products that are listed
in the "Applies to" section.
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