Exchange 2010 to Office 365

I have a couple of email boxes that need to be migrated from exchange 2010 to Office 365. I couldn't find anything out there that fits for my scenario so I'm hoping I can get some help here.

I have 3 2010 Exchange mailboxes that end in .local and are used only for sending email(receiving email is an IMAP client). How do I get to migrate those mailboxes to Office 365? Is there a way to do it or just save their mailboxes as PST and migrate them that way?

Thank you!
Alan DalaITAsked:
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Vasil Michev (MVP)Commented:
If those are only used for sending (i.e. no actual mailbox or messages to migrate), why bother? Simply create a new mailbox/DG/contact or whichever you prefer for them in Exchange Online.

Otherwise, the UPN/domain suffix doesnt really matter, if it's something not routable, it will just be replaced with the default one (@tenant.onmicrosoft.com).

For 3 mailboxes however, you can also just do the .pst export/import. Cutover migration doesnt allow you to choose only specific mailboxes to migrate, staged one will require a dirsync (and if you need it for only those 3, it's a bit of overkill), hybrid is even bigger overkill. So either do a IMAP or just pst export import.

You can compare the different methods here: http://technet.microsoft.com/en-us/library/jj863291(v=exchg.150).aspx
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