Sorry this is one I failed to blog which released while I was at MMS http://support.microsoft.com/kb/950853/en-us .This hotfix is strongly recommended for for those running the Exchange 2007 MP together with http://support.microsoft.com/kb/951979/en-us
Consider the following scenario:
•You import the Microsoft Exchange Server 2007 Management Pack for Operations Manager 2007 into a management group in Microsoft System Center Operations Manager 2007 Service Pack 1 (SP1).
•Then, you install the Operations Manager 2007 agent on an Exchange Server 2007 computer to monitor Exchange rules and processes.
In this scenario, a memory leak occurs on the Exchange Server 2007 computer.
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
1. On the computer that is running the management server role, click Start, point to All Programs, point to System Center Operations Manager 2007, and then click Operations Console.
2. Select Administration view, expand Administration, expand Device Management, and then click Pending Management.
3. In the Pending Management folder, review and approve the agent computers on which you want to apply this hotfix.