Patching Exchange mailbox server without potential data loss

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http://serverfault.com – I have what I think is a quick easy question. I'd like to apply a service pack to my exchange 2007 mailbox server. I don't have a CCR setup, so its a pretty standard configuration. We do have it running on VMware and I plan on snapshotting it before the service pack is applied. My question is, can certain aspects of exchange be disabled so that outlook can't connect to the mailbox server before I snapshot/update the server? I'd like to avoid any data loss if it can be done. For example, one idea I had was disabling the mailbox databases and then patching the server. However, I don't kno (HowTos)