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In Microsoft Antigen 9.0 for Microsoft Exchange, the AntigenService service takes a long time to stop, and the service continues to log events to the Application log when Microsoft Windows is shutting down.
How to obtain the hotfix
This issue is fixed in the Hotfix Rollup 3 for Antigen 9.0 for Exchange with Service Pack 1. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
950791 Description of Hotfix Rollup 3 for Antigen 9.0 for Exchange with Service Pack 1