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Changing service to google workspace. Want to migrate emails from old mail in thunderbird (POP3) to google (IMAP) with the same address

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I already migrate my email service to google workspace with the same email address and domain. The old mail still on the thunderbird (POP3). I want to migrate emails from there to google mail (IMAP). Is it okay to login the 2 same email address to thunderbird, just to move emails from old mail to new mail. And how to do it properly?

I already migrate my email service to google workspace with the same email address and domain. The old mail still on the thunderbird (POP3). I want to migrate emails from there to google mail (IMAP). Is it okay to login the 2 same email address to thunderbird, just to move emails from old mail to new mail. And how to do it properly?

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Having both accounts is no problem. On copying the messages, you could highlight the folder and click 'copy to' if only a few messages. If many, I recommend creating a filter to copy (not move) the messages. When done, spot check that the messages are intact. The challenge is that IMAP was not designed for a large number of uploads.

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Okay then, cause i'm afraid if there's a problem when both account is logged in. Thank you for the response!! I will try it.