We have Exchange 2013 with legacy 2007/2010. My 2007 servers are at RU10. one of my sites has a need to replace their edge server and wants to install a 2013 edge server, but the internal 2007 hub server will require RU13 to communicate with the 2013 edge.
Will updating that single hub server to RU10, and leaving the rest of my 2007 environment at RUY10 cause issues?
Tom