Functional Level 2012 R2 and XP

I was just reading another post on Raising AD Domain Functional Level to 2012 R2.  
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Q_28445025.html

In that post you made reference to XP having issue connecting to file shares after the functional level was raised.  I was hoping to get some more details on that.  We current are refreshing our workstations/laptops. We are moving to Win7 from XP.  We are in flight on the project, however it will be several more months before it will be complete.  In the meantime we are gearing up to move to Exchange Online.   First step on that would be an Exchange 2013 hybrid server, and that would require we raise our FFL and DFL to server 2012 R2.  I'm kind of stuck if I have to wait for the XP replacement project to finish before I can start Exchange Online.  So any information you might have on this would be very helpful.
Owens63Asked:
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Cliff GaliherCommented:
There is no reason an exchange hybrid deployment requires raising functional levels to 2012 R2.
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LeeTutorretiredCommented:
I've requested that this question be deleted for the following reason:

Not enough information to confirm an answer.
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