Microsoft is upgrading the multi-engine protection in all Forefront server security products to support a newer version 8 of Kaspersky engine, that'll provide improved scanning times and reduced signature file size. Customers must install the rollups by before Jan. 31, 2011. If you're not able to install by this deadline, you should deselect Kaspersky engine to prevent any performance issues that may arise from the discontinuation of Kaspersky 5. The rollup release schedule is provided by product below:
"Customers on Forefront Protection 2010 for Exchange, and Forefront Protection 2010 for SharePoint can enable Kaspersky 8. See KB2284024. Customers using Antigen 8.0 for SharePoint or Antigen 8.0 for IM with Kaspersky should contact support regarding Kaspersky 8 engine change.