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A possible time-out condition may occur when an engine is taken offline during the cleanup process of a scan engine update. offline during the cleanup process. When this condition is true, some files may be deleted from the root drive instead of the engine directory itself.
To resolve this problem, install Hotfix Rollup 5 for Antigen 9.0 with Service Pack 1. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
957075 Description of Hotfix Rollup 5 for Antigen 9.0 with Service Pack 1
Note You must install Antigen 9.0 for Exchange with Service Pack 1 before you install Hotfix Rollup 5 for Antigen 9.0 with Service Pack 1.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.