DomainA to DomainB O365 migration

Brass Contributor


I’m planning to migrate O365 domainA to O365 domainB.

Noticed that two options and looking for the best. 


Can we do the stage migration without disturbing
The DomainA mail flow?

Can I forward all the emails temporarily to mail hosting during the cutover?

Ex: forwarded to

Noticed that some issues when removing the DomainA
From O365, 500GB data and DNS changes can cause the
Mail flow failures.

So what are the steps or best way to move 200 mailboxes?

How do I create room, Shared and resources mailboxes in DomainB?

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