Exchange 2010 sp1 coexist with exchange 2010 sp3

My current exchange server giving problems I want to slowly migrate everything over to a new box.  

Current environment server 2008 R2, exchange 2010 sp1

New environment server 2012 R2, exchange 2010 sp3

I just want to verify that both exchange server will coexist even though they are on different service packs.

We dont want to upgrade our current environment to sp3 because of the issues the box is giving us.
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homesgAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
I just want to verify that both exchange server will coexist even though they are on different service packs.

That is correct. Service Packs are backward compatible and they will communicate with other Exchange servers that are on lower SP levels. However if you are keeping the current Exchange server with the lower SP level it is recommended that they are (at some point) upgraded to match the other SP versions on all Exchange servers.

If you are simply decommissioning the SP1 exchange server it will work fine until you have moved everything over.

Will.
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Simon Butler (Sembee)ConsultantCommented:
The only thing to be wary of is client access. You would need to switch client access across to the new server as soon as possible. Remove the external URL configuration from the old server so that Exchange will proxy the information across.
Exchange will downgrade as pointed out above, but not upgrade.

I would also recommend you configure an RPC CAS Array as well, which will make life easier for you with regards to moving the client access functionality for Outlook.
http://semb.ee/casarray

Simon.
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