Applying CU4 for Exchange 2013 SP1 in a mixed 2010 / 2013 Environment
We're planning to apply Exchange 2013 SP1 CU in our mixed 2010 / 2013 environment. We'd also like to apply Exchange 2010 SP3 Rollup 5 as well. Are there any gotchas or best practices on what update to ap
June 19th, 2014 3:34pm

I would start with Exchange 2013 UR install as those will be mostly your client facing...

Then Exchange 2010 UR in below sequence...

CAS
HUB
UM if you have
MBX
Edge Transport

Install the Latest Update Rollup for Exchange 2010

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June 19th, 2014 5:51pm

Thanks for the note back Amit! That looks good to me.

I had one more concern about the Exchange 2010 SP3 UR5. The deployment notes mention an update issue with CAS Proxy Deployment. I don't believe we're configured this way, but we do have two CAS servers as a result of our coexistence, one on Exchange 2010 and one on Exchange 2013. That's not the same thing

June 19th, 2014 6:02pm

Yes, it does proxy the http requests when you have two CAS (one with 2010 and one with 2013) but when it's with different version its doesn't matter but still start with internet facing CAS server which would be most likely your Exchange 2013 server wehre external users would be connecting...
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June 19th, 2014 10:33pm

Thanks for the help Amit. I've a bit more confidence going forward.
June 19th, 2014 10:53pm

We are planning to update our 2013 from CU5 to CU8

and 2010 SP3 to Rollup 9

I cant find any official documentation from MS concerning the upgrade path. Example. 

Exchange 2013 first, then 2010. Like the above post outline. 

I see 2010 being upgraded first thus bring version numbers closer together, reducing incompatibilities. 

Do you still feel this is the appropriate install procedure? 

Have you done this? 

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April 2nd, 2015 2:22pm

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