We have a Server 2003 domain running Exchange 2003, I also have a server 2008 r2 member server. We have purchased an Office 365 subscription to replace the in-house Exchange.
I have been reading up on dirsync and want to use it to keep the domain and O365 login details in sync. My questions are:
1. can i install dirsync and use it to populate the O365 environment with all the users in advance of the cut over to O365 for email delivery, i.e with internal Exchange still running?
2. i know i have to create an OU in AD to put all the existing AD users in that will have O365 accounts, do I also need to add a UPN name in AD, is this the 'user logon name (pre windows 2000)' if so does this name need to be the same as the email address in O365?