![]() ![]() Type in your username, Office 365 email address ( and password – then click Continue: Under Account Actions (bottom left), choose Add Mail Account: Next, connect your Office 365 account to Thunderbird by right-clicking on your account in the navigation bar on the left, and selecting Settings: Start by opening Thunderbird on the user’s computer – since their email is connected to a POP3 account, make sure that Thunderbird has downloaded all new email from the server so that you can be certain you have everything:Ĭlick on Get Messages – Get All New Messages: ![]() Migrating Email from Thunderbird to Office 365 That said, I managed to come up with a process that allows you to (fairly) easily migrate your email from your POP3 account into Office 365, using Thunderbird as your vehicle of choice. Mind you, a connected account is only going to help you if the messages are still on the server – my problem of migrating emails that have already been downloaded would still remain. Using connected accounts used to be an option (albeit not my favorite one, since there are no controls to ensure that you’re getting everything you need migrated over), but Microsoft is deprecating that option, so it’s not a reliable way forward. Besides, even if we installed Outlook, migrating/importing from Thunderbird to Outlook is enough of a process – might as well do the job once, and take my emails directly to Office 365, rather than do a two-stage migration. Also, since it wasn’t Outlook, we couldn’t just create a new email profile, and attach the PST file for easy access or moving the email. ![]() Of course, if there was a copy of the messages on the server, then IMAP would have been an option – since there wasn’t, I needed a way of getting all my email out of Thunderbird into Office 365. It’s been a long time since I had to do a POP3 migration, but I ended up finding myself needing to come up with a solution to migrate a small number of users (around 50) who currently used Thunderbird, were downloading their email over POP3 and were not leaving a copy of their messages on the server. Every now and again I come across some oddball migration scenarios that require some out-of-the-box thinking. ![]()
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