After years of using Thunderbird and POP, I am looking to move my mail back to the server and use IMAP to make sync'ing multiple devices easier.

The aspects of creating the IMAP user in Thunderbird, then dragging the existing files over makes sense. BUT before I start I am wondering about the fact that these folders have messages from multiple email accounts.

We have multiple email accounts for the business, and over the years have stored message based on category rather than email address, so most every folder has email from multiple accounts.

If I drag a file to the new IMAP account with mixed addresses, will it upload the whole folder or will it choke when it reaches an email form another account?

1 Answer 1


It shouldn't be a problem to drag and drop files to the IMAP account regardless of the mixed email addresses. However you could use MsgExtract to migrate your email messages to IMAP as it can translate your old email addresses to new ones that you define, e.g:

js@hotmail.com to jsmith@gmail.com

You can read further at:


MsgExtract can read Thunderbird files end export them to IMAP. You just need to select the folders that you want to process.

(Disclaimer, I am the author of MsgExtract)

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