Migration to Office 365 from SBS 2011 with online archive enabled

I have a client with SBS2011 where most of the mailboxes have Online Archive enabled.
I will be migrating them to Exchange 365.

What would be the best way to transfer the data from the archive back to the mailboxes prior to the migration?
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Vasil Michev (MVP)Connect With a Mentor Commented:
Archives can also be migrated, depending on the method you choose. But if you insist on merging the archive and the "primary" mailbox, there are two options:

1) Use PST export/import
2) Use some EWS based script to copy the content of the archive to the primary mailbox, such as the one here: https://code.msdn.microsoft.com/office/PowerShell-Merge-mailbox-e769c529
You can directly export converted mailbox's PST file to Office 365 mailbox.
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