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When you empty the cache for a Microsoft Exchange Server account in Microsoft Entourage 2004 for Mac, you may lose the changes that you made to the e-mail messages. For example, if you marked a message with a flag, or if you marked it as read, the message may appear in your Inbox without those changes.
This issue may occur if you empty the cache for your Exchange account before the changes are synchronized to your Exchange Server computer.
To work around this issue, do not empty the cache for your Exchange account before changes are synchronized to your Exchange Server computer.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.