Hi,
Exchange 2013 CU7 on Server 2012 R2.
We have separated the roles into mailbox server and front end. Mailbox servers are installed on physical servers, front end is virtualized.
We still have Exchange 2007 SP3 Rollup 10 in the environment but not hosting any user mailboxes.
The issue is when someone forwards a meeting invite, the MFN is delivered many times to the organizer. In some cases 100s of times. I have increased logging levels on all of the MSExchangeMailboxAssistants\ sub-categories on the mailbox server reported in the headers but see nothing useful in helping to troubleshoot.
Any tips on where to go from here are greatly appreciated.