I am running Exchange 2010 on Windows Server 2008 virtualized on VMware ESX 5.1.
The machine is not a real reason to worry. It runs, but every once in a while there are odd ADS issues. Rights seem to vanish, SIDs are shown instead of user names. A reboot fixes those issues every time.
I would like to update the OS to Windows Server 2008 R2. But I have never updated the OS of an Exchange server.
Are there good reasons for or against this OS-udpate?