F5 with mixed Exchange 2007 and 2010 Client Access Servers

My organization is about to migrate from Exchange 2007 to 2010 and have a very similar problem. We were advised by Microsoft Consulting Services that an F5 with the APM is what we need to achieve our rather unique requirements.

 

 

While I understand that relying on 2010 CAS to proxy/redirect users to 2007 CAS is the official supported method by Microsoft, that does not work for Mac Mail users. For some reason, the Mac Mail client will never proxy to a 2007 mailbox when connected to a 2010 CAS. Since we have a very large number of Mac Mail users, Microsoft recommend we go the F5 route, and use it's logic to redirect to 2 different pools.

 

 

I am very new to F5 and so far have had some success in using the 2010 iApp to load balance AS/OWA/OA/AD to either the 2010 or 2007 CAS Pools. I just don't know where to begin with creating redirection logic either with iRules or the APM.

 

 

Has anyone here actually done this before?

 

 

Thanks in advance...