It keeps a copy of your email on the server. The other type of service is called IMAP (Internet Message Access Protocol). That type of service is called POP3 (Post Office Protocol version 3). That’s one of the disadvantages of your Internet Service Provider’s mail service they have elected to store none of your emails. I can tell that you’re downloading all your email to your own computer, and not keeping it on the server. Since I know, from your return address, what email provider you’re using. You should be regularly backing up everything anyway, but do an extra backup just before you do the upgrade. First, as always, backup everything before you upgrades. There are several points to be made here. Of course, if you’re using the very latest version of Thunderbird, you select the three bars icon on the far right (believe it or not, that’s called the “hamburger menu”), select the Advanced icon, then select the “Network & Disk Space” tab, then hit the “Clear Now button to both clear your cache and compact all of your folders. Just start Thunderbird, then select File -> Compact Folders, and wait. Thunderbird Email Windows 10, does a regular compression - which you can see at Tools → Options → Advanced → Network & Disk Space → “Compact folders when it will save over X MB” - so you don’t have to do one by hand usually, but before a move, you should definitely do one. We should compress your email first - this gets rid of stuff you’ve deleted, and makes the resulting files smaller.
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