Is it possible to have Exchange Server 2010 and 2016 coexist with BES Server 5? I know BES does not work with Exchange 2016 but I have a customer who will not give up blackberry/bes server for 1 user. If the users mailbox lives on exchange 2010 with BES 5 pointing to Exchange 2010, can Exchange 2016 coexist with 2010/BES5 where all users not on the BES server will be migrated to 2016.
I know 2016 can coexist with 2010 as I've done many migration from 2010 to 2016 but my main concern is will BES function if I introduce 2016 Exchange.
