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Can I use Thunderbird on the Apple Mac to move email from O365 Outlook to Gmail?

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Have all my emails in Mac Outlook. Need them in Gmail. Will Thunderbird copy Outlook emails on the Mac to Gmail? If I set up both accounts in Thunderbird on the Mac, can I move emails between them?

Have all my emails in Mac Outlook. Need them in Gmail. Will Thunderbird copy Outlook emails on the Mac to Gmail? If I set up both accounts in Thunderbird on the Mac, can I move emails between them?

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You can import Outlook mail to TB, and you can transfer mail between accounts in TB, in a limited way, but it might be easier to have your gmail account collect the mail from the account in O365, if that mail is still on the mail server:

https://support.google.com/mail/answer/21289?co=GENIE.Platform%3DDesktop&hl=en

Can you not also add the gmail account to Outlook and transfer the mail from the other account?

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It looks like the Outlook email has been archived on the Mac in .olm files. The files are not on the Exchange server. So I need a way to move the .olm files on the Mac to Gmail on the Mac. Can TB do that?

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It looks like Outlook on the Mac prevents transferring .olm mail to a Gmail account in Outlook.

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I can't help with Outlook details, but if Outlook and TB are installed on the same computer, TB might be able to import the Outlook mail. In TB, Tools/Import..., select Mail, not Import Everything, and see if TB recognizes the Outlook setup.

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The basic question is whether TB can import Outlook Mac archived files with an .olm extension (Outlook Mac archive) into a Gmail account that has been installed in TB on the Mac.

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The basic question is whether TB can import Outlook Mac archived files with an .olm extension (Outlook Mac archive) into a Gmail account that has been installed in TB on the Mac.

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The answer is no, TB can't import any Outlook Mac archive type. Look for software to convert .olm to mbox format, which can be imported to TB.