Running Windows Service Packs on Exchange 2010

I need to run Windows Service Pack 1 for Windows Server 2008 R2 (not sure if SP2 is out yet).  Is it better to stop all Exchange services and SQL services BEFORE running the Windows OS service packs?  AND in order to run the SPs on Exchange, the mail services HAVE to be running?

We are in disagreement as to which is safer and appropriate.
cobmoIT ManagerAsked:
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AmitIT ArchitectCommented:
SP1 is the latest. SP2 not yet released. From application perspective, you need to make sure to take full application backup before starting any update. Don't need to stop any service, service pack process with do everything automatically.

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Nick RhodeIT DirectorCommented:
You can stop them if necessary but it is not necessarily needed.  When installing service pack 1 for 2008 R2 it will stop the necessary services required to install the service pack.  If you are going to update exchange to service pack 3 it will do the same thing.  During the updates the services will be temporarily disabled so expect some downtime for the service packs to install for reboots are required.
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