I mean that there is an existing O365 domain with users, mailboxes etc.
There is also a (new) AD Domain with mostly the same users (almost 1-1).
We need to capture all of the information in O365 and add it to AD and then be sure to associate the Active Directory Users (now with supplemented information) to the existing email of the former O365 accounts.
We don't want to lose anything.
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HerbM