Coexist between exch 2007 and exch 2013

I know I have to make changes to the owa, active sync, and oab on the exch 2007 server once I have the exch 2013 server up and running but is there any other changes needed on the 2007 server or will that be enough for the servers to coexist during the migration period?
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vmichAsked:
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AmitConnect With a Mentor IT ArchitectCommented:
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Will SzymkowskiConnect With a Mentor Senior Solution ArchitectCommented:
The latest release for Exchange 2013 is CU8. If you have not installed Exchange 2013 in your environment i would be using this install as it is the most recent.

Also the best steps for deploying Exchange if you are unsure of all the steps is using the Exchange Deployment Assistant. This will guide you through the entire process start to finish with all of the high level steps. This works for co-existence deployments/green field deployments/DAG etc.

Exchange Server Deployment Assistant

High Level Steps are below...
- create new cert request with mail.domain.com and autodiscover.domain.com, legacy.domain.com
- Install new cert on all Exchange CAS servers (2007 and 2013)
- Set all of your URL's for exchange 2007 to https://legacy.domain.com/....
- Set all of your URL's for exchange 2013 to https://legacy.domain.com/....
- Autodiscover should be the same https://autodiscover.domain.com/......
- ActiveSync should be proxy-ed from Exchange 2013 server as this is more reliable
- Enable the certificate on all CAS servers using Enable-ExchangeCertificate
- Move mailboxes/services/publc folders/ to Exchange 2013
- Once everythnig is move over you can decommission the Exchange 2007 environment.

Will.
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vmichAuthor Commented:
One more question..
the exchange 2007 server is running SP3 with rollupdate 10, is that good enough to coexsit with exch 2013?
I ask because some things say 10 is ok and others say to have rool update 13...
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AmitIT ArchitectCommented:
RU10 is minimum requirement, which you already have in your environment. However, having latest updates are always good. I prefer to keep n-1. Check this article for co-existence.

https://technet.microsoft.com/en-us/library/aa996719(v=exchg.150).aspx
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vmichAuthor Commented:
ok good. So i will stick with update 10 because the exch 2007 server is not very stable and I hate to do anymore updates to it before we get rid of it...
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AmitIT ArchitectCommented:
Ya, that's is better, as you eventually going to remove 2007.
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vmichAuthor Commented:
steps needed for coexist from doc
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