I'm gearing up for migrating about 30 users from exchange 2003 (sbs 2003) to Server 2012 R2 Standard + Office365.
Information store is 130GB. (I have spent nearly a year restarting it every night to keep it running.)
Internet upload speed is usually 7-8Mbps as per speedtest.net
There seems to be lots of info about specific stages, but I'm finding it difficult to piece everything together in a coherent picture that is relevant to this situation.
The old server is functional. The new Server is up and running on the same network although DHCP is disabled and domain and users are not configured.
Stations are still logging into the old domain.
I want to migrate the Exchange over using the cutaway migration method, as manually uploading PST's could take days and then I'd have to cleanup the items in the gap after.
Question #1 I want to use DirSync and Single Sign-on. One source seemed to indicate that Dirsync cannot be used if you've done a cutaway migration. Is this still accurate? Can anyone verify this either way?
Question #2 I want to change all of the usernames from First initial.Lastname to FirstnameLastname which is the same as their e-mail address format. Can this be done after moving to Office 365 or should it be done before?
Question #3 Does the new on premise domain controller domain name matter? Does it need to be related to their external mail domain? Should it be the same as the old domain?
(currently is domain.com for e-mail domain & domain.local for internal)
Thankyou for taking the time to read this!