Guidance, Tuning and Known Issues for the Exchange 2010 Management Pack for System Center Operations Manager 2007
This article is intended to give some best practice guidance along with workarounds to known issues involving the Exchange 2010 Management Pack (MP) running on System Center Operations Manager 2007 (SCOM). Please look through this document before calling for support or posting to the forums as the issue may be covered below. If you find that these issues are particularly troublesome or find additional issues that you want fixed please call into Microsoft Support and raise a Request For Hotfix with the Exchange group.
Check this KB out at: http://support.microsoft.com/kb/2592561