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Installing SP2 is a relatively straightforward affair and Exchange 2010 SP1 and SP2 servers can co-exist peacefully alongside each other for as long as it takes to roll out SP2. However, it is best practice to run a consistent software level across an entire Exchange organization so it’s best to schedule the updates to occur as quickly as possible. Of course, don’t do this until after you’re happy that SP2 meets your needs and requirements and has been tested in your own environment. The biggest hindrance in the update process for most people is likely to be the requirement to schedule the prerequisite Active Directory schema update, which is required to support new features such as Address Book Policies (ABPs). Once the schema has been updated and replicated throughout the Active Directory forest, you should be able to upgrade Exchange 2010 SP1 servers following the normal order of CAS-Hub Transport-Mailbox servers (Edge servers can be updated first or last, UM servers should be updat