I need ot migrate our Exchange users to Office 365. I am going to need some help and I have some questions.
1. When I was setting up the trial, it requires me to change some MX records in the external DNS. This I can do, but by doing this will I affect our current users on Exchange 2010? My users cannot handle downtime whatsoever. I want to do this in the most unobtrusive way possible.
2. I am migrating about 400 mailboxes, which method is best used for this?
3. Is there a clear step by step process I can use? I have seen two versions - hybrid and staged and I need to understand what I need for each process.