Thunderbird - POP3 to IMAP

Hi all,

I've recently switched OSes from Windows 7 (64-Pro) to Ubuntu Linux Mate 18.1

I was using T'bird on my Win PC. T'bird came with Ubuntu & so I set it up as a POP3 account, The same as on my Win PC. A little while later, it occurred to me, after doing a little research, that using IMAP would be better for my situation So, I changed my Win PC T'bird configuration over to IMAP. Now, I would like my Ubuntu PC to be IMAP too, but I've been unable to be successful at re-configuring my T'bird account in Ubuntu. I keep scratching my head as no matter what I try, nothing works. I even thought of uninstalling T'bird & reinstalling it, but I don't know how. :(

I'm very new to Ubuntu & so I don't know how to do a whole lot, yet, much less reconfigure T'bird.

Can someone please walk me through the correct procedure?
THANX in advance!

Also, what does it mean every time that I start T'bird I get an error "Unable to open spool file"?


Well-Known Member
G'day Pierre, and Welcome to

"unable to open spool file' hopefully will disappear when we get Thunderbird set up correctly

The settings shown below will help (I hope)
Server Type: IMAP Mail Server
Server Name: Port 993
Connection Security: SSL/TLS
Authentication method: 0Auth2

In addition.......On your win 7 PC....Open on 'Edit".......then 'Account Settings'....then click on server settings (at the top)

Write down the info there that you will need...or if these are two separate PC's yopu may be able to have win 7 open on one and Linux open on the other.......and just move between the two pc's checking/rectifying the necessary info as you go.

My page in Thunderbird looks as below...

Hope this helps clear out the gremlins.

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