Hi,

Does anyone have any thoughts benefits for CRM 2011 or 13/15 and upgrading the Exchange server from 2007? What would be benefits to CRM if we upgraded from Exchange 2007?

I see that CRM 2015 is not supported on Exchange 2007. Was wondering what other benefits would be there

There are lot of benefits to migrating from Exchange 2007 to Exchange 2013.  The best place to start would be to take a look at the new features in Exchange 2013. the introduction of DAGs in Exchange 2010 and continuation of the DAG in Exchange 2013 and the changes to CAS and Mailbox roles are just a few of the benefits. 

https://technet.microsoft.com/en-us/library/jj150540%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396

As benefits of updating CRM, I suggest you post that in the forum below.

https://social.microsoft.com/Forums/en-US/home?category=dynamics