[vondur]

I know people that used it because it was self contained for Windows if I remember correctly. I remember one person running the installation off of a Zip drive back in the 90's. I warned them that Zip disks like to randomly self destruct and he'd better be making backups.

[lproven]

If you want that, there is Thunderbird Portable.

https://portableapps.com/apps/internet/thunderbird_portable

:-)

[tracker1]

Thunderbird Portable + Dropbox FTW

Used to rely heavily on this, until an upgrade on one of my systems blew up the entire profile and I just stuck with webmail mostly. On my phone I have gmail, Outlook and Thunderbird (forked from K-9).