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Exchange to 365 Migration Questions
If there is a better place to direct this question, please let me know. We recently acquired a small company and they have Exchange on-prem. They have their own domain (oldcompany.com), and we'd ...
Well technically, it will be a new user as those are different systems. However, the user object will be linked to the on-premises one, and the mailbox can then be "attached" to it. The benefit of using Hybrid is that there will be no need for the end user to reconfigure their profile, but for just a handful of mailboxes you might indeed go the manual export/import route.
You cannot use either Hybrid or Cutover if an Office 365 mailbox already exists for the user.
You cannot use either Hybrid or Cutover if an Office 365 mailbox already exists for the user.