Dear All
our company will update exchange 2007 to exchange 2013, on AD site we already update Forest functional level and Domain functinal level to Windows 2003 ( can not up to windows 2008 yet because have some ad that run windows 2003 server ) but one thing that I'm not sure, between migration we can not full tranfer mailbox form exchange 2007 to exchange 2013 in one time, we need to migrate on night time manybe one day we can migrate only 100 user per night, my question is
1. which exchange 2013 server role that we will install first ( mailbox or CAS)
2. on migration time, can we let's user used exchange 2007 to main of OWA and SMTP or not? we need all user's mailbox tranfer to exchange 2013 complete first after that we will switch OWA and SMTP