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
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
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?