Microsoft released Hotfix Rollup 3 for Microsoft Antigen 9 for Exchange SP2. "Microsoft will be retiring version 5 of Kaspersky engine on Feb 1st, 2011. You're required to install Rollup 3 for Antigen 9 for Exchange/SMTP with SP2 before this date if you wish to continue using Kaspersky engine. This rollup doesn't automatically install Kaspersky 8 engine. The new engine will be download through next successful engine update, after installation of the rollup. If you wish to download new engine immediately after rollup installation, you can perform a manual engine update by navigating to SETTINGS then Scanner Updates in Antigen Administrator client. Select Kaspersky engine and click on "Update Now" button. Confirm that engine update completed successfully and Antigen will now be using Kaspersky 8 engine," explains Microsoft in KB2302001.
Download: Hotfix Rollup 3