office365 cutover migration


I plan on doing a office365 cutover migration from exchange 2010 using the HTTPS RPC method.

I have created the batch migration in the office365 exchange web panel with the batch file of users to migrate.

my question is, if I start the sync will it just sync the mailboxes as a copy to office365 or move the emails from the onsite local exchange store to the office365 mailboxes?

any help appreciated, I just need clarification
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Vasil Michev (MVP)Commented:
Two things:

1) Cutover migration does NOT use batch files, it will connect to the on-prem server and use the GAL information to move every user, DG, etc. The only way to exclude objects is to hide them from the GAL
2) It does not move anything, it creates a copy of it in the cloud. You will still have the on-prem mailbox, which might actually present a problem after the migration - in a domain environment Outlook will always hit the local Exchange first. An easy way to sort this is to bypass the local lookup following this article:

Here's also the link to the cutover migration guide, make sure to take a deeper look into it:

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utilizeAuthor Commented:
thanks, sorry I meant batch migration as in all the users migrated at once.

I though it did a copy I just wanted to confirm. once migrated we will decommission onsite and change mx etc, and stop services on onsite exchange server.

thanks for your quick response!
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