Exchange 2010, two servers with different Service Pack levels?

Can two Exchange 2010 server co-exist peacefully (and communicate correctly with each other) if one has SP2, the other has SP3?
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Ben HartAsked:
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Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
Yes there is no such compulsion and can stay at their own SP levels :)

http://technet.microsoft.com/en-us/library/jj965774%28v=exchg.141%29.aspx
If you're upgrading from Exchange 2010 SP2 or SP1 to Exchange 2010 SP3, the upgrade process takes less time, because there is no database schema upgrade. In addition, you can safely move a database between servers running Exchange 2010 SP1, SP2 or SP3. Even though you can move databases between mailbox servers running different service pack levels

- Rancy
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Will SzymkowskiConnect With a Mentor Senior Solution ArchitectCommented:
The service packs are backward compatible with each other and mail will continue to flow accordingly. The service pack that you install only affect the server in question.

Will.
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AmitConnect With a Mentor IT ArchitectCommented:
If they are on different sites you can with some terms any condition. If they are on same site, you cannot, you should upgrade all to same version.
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Ben HartAuthor Commented:
Thanks guys.  the timing is such that a simultaneous upgrade isn't possible.
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