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Exchange 2003 to office 365 cut over migration

we are planning to move in office 365 from our on premise exchange server 2003.

We have around 100 mailbox so we would like to do cut over migration. we have verified the prerequisites for the migration and we just want to confirm that how the mailbox batch will be move to the office 365 during the mailbox migration.

If  we configure the endpoint with 5 mailbox for the migration then shall we select the specific 5 mailbox from all the 100 mailbox? So that we can manage the priority of mailbox migration with office 365.

We want to select manually 5 mailbox for the migration batch in the cut over migration. Is it possible? How? can you provide steps for the same?
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Vasil Michev (MVP)
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Cutover migration is 'all-in-one' solution, the process will connect to your on-prem GAL and will migrate every mailbox/DG/contact that is visible in the GAL. So, one option is to hide everything that you DON'T want to migrate from the GAL. Or use a different migration method.

The option that you are referring to in the endpoint wizard is the number of SIMULTANEOUS migrations. It will not allow you to select which mailboxes to migrate first.

Here's the general article in case you have not reviewed it yet:

http://technet.microsoft.com/en-us/library/jj874016(v=exchg.150).aspx
If you want to just move 5 mailboxes at a time, you should do a Staged Migration instead.  With this method, you can create a batch .csv file with just the mailboxes you want to migrate and run that batch.  Then, once you are satisfied with the results you can do other batches with as many mailboxes as you like.
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rigelnet

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should I create a batch .csv file for the cut over migration. so that I can specify the mailbox for the migration.
I want to do cut over migration and I want to move all the mailbox but priority wise and using batch files like .csv.
Because I don't want to move management mailboxes and other important mailboxes first.

I will move all the users mailboxes first and then will do management mailboxes.
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Vasil Michev (MVP)
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Thank you for the explanation now I am clear.