This issue has been confirmed to occur on the Snow Leopard and Lion operating systems when McAfee Internet Security 18.104.22.168 is installed. However, it may also occur on other versions of these products.
When the data files that incorrectly undergo this change are critical files that store the sync state, Outlook may generate duplicate email messages. Depending on the files that are affected, this incorrect behavior may also cause other problems.
- /Users/<username>/Documents/Microsoft User Data/Office 2011 Identities
- /Users/<username>/Library/Caches/TemporaryItems/Outlook Temp
Microsoft has reported this problem to McAfee, and McAfee is investigating a solution.
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
Article ID: 2740145 - Last Review: Sep 14, 2012 - Revision: 1