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Thunderbird Portable

Print hangs up - never prints

Submitted by Rodeo6701 on February 7, 2022 - 2:47pm

I've been a user of Thunderbird Portable for many years, and this is a recent problem.

My current Thunderbird Portable is Version 91.5.1 (32 bit).

Sometime a couple of months ago, after I believe there was a Thunderbird update, I began to have a problem when trying to print an email message from Thunderbird. The "Preparing Preview" screen opens, and then never proceeds at all. There is a spinning icon by the words "Preparing Preview" - and on the right side of the screen is the word "Print".

Thunderbird 91.5.1 can't access FTP calendar

Submitted by jf on February 2, 2022 - 5:05am

I use a network calendar on my LAN that has the following URL:


TB portable cannot synchronize it because TB portable does not know how to open the URL: it briefly asks which app to use in a window ("How do you want to open this? Google Chrome, Internet Explorer, Microsoft Edge") that immediately disappears. The calendar is listed but remains empty.

I thought a ftp client was included in TB to handle FTP URLs.

ThunderbirdPortable leftovers in AppData and Registry

Submitted by AbsolutelyRandom on January 30, 2022 - 3:42am

I have found a few Thunderbird-related leftovers. I use Win7x64. I have been using Thunderbird since the previous version (91.5.0 I suppose). I've been using two extensions: Dark Reader and Thunderbird Conversations.

1. AppData\Local\Thunderbird
2. AppData\Roaming\Thunderbird
1. HKEY_CURRENT_USER\Software\Thunderbird
2. HKEY_USERS\***pc-user-personal-id***-Classes\Software\Thunderbird

***pc-user-personal-id*** - it's a random string which is different for each Windows user profile

migration problem

Submitted by philric on January 22, 2022 - 12:46pm

hi everybody, i have thunderbird portable ( in my external hard drive (E:) i changed my ssd (C:) for a bigger one and it's not working anymore, thunderbird open but like a new install without any account and ask me to set a new one, i dont understand why this happen as its not on C; it should work with any computer as portable, if someone have an idea it will be apprecated as i spend 2 days aleady to try to fix it and get my mail! thanks

[Fixed] Thunderbird Portable 91.4.0 leaves empty file in ProgramData

John T. Haller's picture
Submitted by John T. Haller on December 19, 2021 - 12:54am

Thunderbird Portable 91.4.0 leaves an empty file named UpdateLock-XXXXXXXXXXXXXXXXX in ProgramData after being closed. This is due to the way Thunderbird calculates the CityHash of the path it is running from.

I felt it was more important to update Thunderbird than to have it perfect. I spent a few hours poking around the 2GB of Thunderbird source to get it to match. I'm likely just missing a small detail. I'll be working on this to get it sorted in the next release.

Thunderbird RSS

Submitted by tlchost on November 30, 2021 - 6:25am

My rss feed of has disappeared from thunderbird. From what I can see on the site, there is no option to select an RSS feed that can be used with thunderbird. Please clarify.


Mails gone - please help

Submitted by Bombini on November 19, 2021 - 2:36am


i started my Thunderbird Portable this morning and everything seems to be gone.
It asks me to setup my emails like nothing is installed. Its looks like my ThunderbirdPortable.exe is starting Thunderbird 91.3.2?

The mail folders are still there and full but Thunderbird cant "find them" anyome?. For example: E:\Mail\Data\profile\Mail\

Using Windows10, external drive.
Any advice?

Thanks a lot!

Thunderbird Portable 91.x Release Date?

Submitted by clickclick on November 15, 2021 - 1:19pm
scriptdaemon wrote "Mozilla Thunderbird 91.3.0 (John building for Stable release in line with local Stable push...)"

What will the actual version of Thunderbird Portable be that replaces the 78.14 version?

Firefox 91 ESR portable has been released, but nothing for Thunderbird which basically has the same Mozilla stable release
schedule as Firefox.

Thunderbird Portable as Default Mail Client (Integration)

Submitted by Neddenien on November 9, 2021 - 2:57am

Here is the best and easy solution to make ThunderbirdPortable as Default Mail Client...

1. Create a subfolder in your ThunderbirdPortable folder (for example: "..\ThunderbirdPortable\Windows")

2. Change to the created subfolder to create the following batch-file...

3. Create a batch-file (for example: "Thunderbird Portable Integration.bat") with the following content :

Using browser mailto:// links, Registry Key appears wrong - Solution here...

Submitted by PaulNormanNZ on October 19, 2021 - 2:20am


Been loving using Thunderbird for years, but when I switched from the regular installed version, to PortableApps, one thing I could never get working again, was clicking a mailto:// link in any browser, it always tried to turn the requested email into a newsgroup message.

Any way I have found an answer, and it has to do with the way that a Registry key is being written by the System.