If we deploy Exchange 2013 in co-exist envt with Exch 2007 and have to shut down Exch 2013 for some maintenance / update, does Ex-2007 takes care of the mail flow for the users who are still on Ex-2007 and not migrated over to Ex-2013?
I know there won't be any issue for outgoing email. I am not sure for incoming emails. Any suggestion?
Thanks.