We came across an issue recently where we had placed a few servers into maintenance mode and when we stopped maintenance mode the servers did not change back to a healthy state, they were in a not monitored state.
We left it for an hours to see if the agent would sort itself out to no avail.
It appeared that the agent seemed to be stuck in the not monitored state, so what i did next was to try and refresh the agent was to put it into maintenance mode for 10 minutes and then stop the maintenance mode and within minutes the state changed to healthy again 
Hope this helps
Daniel Davies
Currently at this point in time you will be unable to monitor your Exchange 2010 environments via SCOM R2. If you install the MP you will come across the below errors and if you go install the required KB you will hit a problem as this update has not current been released.
“Critical hotfixes required for reliable operation of the Exchange Server 2010 and other management packs are not installed on this server. Please see the appropriate KB article for more information, and to download the required hotfix.
For Operations Manager 2007 SP1, install KB 971541 (http://go.microsoft.com/fwlink/?LinkID=167911)
For Operations Manager 2007 R2, install KB 974144 (http://go.microsoft.com/fwlink/?LinkID=167912 “
This is Due to the KB update for SCOM R2 currently not being released, so for the time being you will not be able to monitor your Exchange 2010 environments via SCOM R2.
After speaking to Microsoft the KB should be released before the new year.
Thank You
Daniel Davies
It is always important to have up to date Management packs, this is because in updated management packs their can be new monitors and rules which are not included in the current version of the management pack and therefore making you miss potential issues. Bug Fixes may also be included in updated MP’s so updating can also reduce the amount of noise from SCOM.
The task of updating SCOM R2 Management Packs is fairly Straightforward.
Upgrading Management Packs
1, If we firstly go to the administration tab on SCOM console
2, Now if We Right Click Management packs on the windows on the left and choose import management packs
3, Next if choose the add option and then the add from catalog option. The Add from catalog option, basically checks for new MP’s from the Microsoft Management Pack catalog.
4, If we change the View drop down to update management packs. This will then compare our MP version to Microsoft catalogues and let us know what MP’s we need to update when we hit search.
5, You will now see the management packs you need to update. If you choose what management packs you want and press the add option and then finally hit ok.
6, Then Install the MP’s and you’re done.
Daniel Davies
I have come across an issue recently where Servers with a SCOM Agent installed are running at 100% CPU, and when you look at task manager on the server you can see multiple CSCRIPT.exe processes running.
CSCRIPT.exe is what SCOM uses to run scripts on the SCOM agents.
The simple fix for this is to upgrade WSH to version 5.7 and the issue with the CPU just simply goes away.
Daniel Davies
