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My thanks again to sfhowes, Rick and others for assisting me to get back my ability to once again send e-mails from Thunderbird. Now for the next step.

Just days ago, I migrated my years of Thunderbird e-mails on a POP protocol to IMAP. Before doing so and before also uninstalling my old Thunderbird because of e-mail sending problems and then reinstalling a new version, I saved a profile. Now with the most current version of Thunderbird, I lost (i)a decades worth of saved inbox e-mails (but for the last 2 years), (ii)I lost all of my sent e-mails but a few odd ones, (iii)I lost my archived e-mails in Local Folders and (iv) I lost all of my contacts and saved group e-mail address lists.

My profile is saved on an external hard drive. Obviously the new installed version of Thunderbird must have somehow found the last 2 years of my inbox e-mails but nothing beyond that as mentioned above. Can you share please a recommended procedure where I can better import what I assume I saved correct on the profile I saved twice (I saved a master folder named Profile and separately saved 4 folders - 2 folders ending in default and 2 ending in default-release. Thank you.

I am on Thunderbird Flatpack version 115.5.1 and I want to transfer to Thunderbird for Android, how do I do that, please? I am running on Chromebook using the Linux partition. I have exported the profile to a zip file, but Thunderbird for Android won't read it. The zip file is 2.5GB so maybe it is too big. But I am not adept at Linux and I can't find my way to the profile files for a manual copy. When I go into Troubleshooting Information the Profile Directory - Open Directory button does nothing. Alonside it it says "(Lolcal drive)". Maybe I should upograde Thunderbird first, but how do I do that, please?

I just installed Ubuntu 24.04.3 LTS to an old computer and I want to export my profiles and contacts from my other Windows computer Thunderbird, over to the new Linux version of Thunderbird. I suppose the other option is to re-import from Gmail contacts. Please advise. As others migrate from Windows to Linux this could be a common question.

I am trying to setup Thunderbird on a new Windows 11 PC. My current PC is running Windows 10. I am thoroughly frustrated to the point where I might just switch to Outlook!

First some basic parameters.

On a "techie" skill level I am about a 3 on a scale of 10. I have been a Thurderbird user for a long time, 15+ years. The Thunderbird version on the Windows 10 PC is 140.3.1esr(32-bit) The Thurderbird version on the Windows 11 PC is 143.0.0(64-bit) I managed to stumble through a Thunderbird migration change 6 years ago when I purchased my current Windows 10 PC.

Here are the issues I am having.

1. I do not know how to locate and transfer to the new PC all of my contacts. 2. I do not know how to locate and transfer the sent mail history. 3. The Windows 11 PC version is not synchronizing with the mail server (Comcast.net). When I read, delete, or move an email it is still showing as unread on my other devices. (The Windows 10 PC, iPad, iPhone) Conversely, if I read an email on one of the other devices, it still shows as unread on the Window 11 PC. 4. The is no Junk mail showing in the Junk folder on the Windows 11 PC, but junk mail will show in the Junk folder on the Windows 10 PC. I clean the Junk folder regularly. However, the junk mail is being filter out on the Windows 11 PC because it is not showing in the Inbox. 5. (Somewhat minor) On the Windows 11 machine the preview panel is on the right. On the Windows 10 machine the preview panel on the bottom. I prefer the bottom. I don't see in settings were to change this.

What I have done so far: 1. I compared setting for setting from the old PC to the new PC. I noticed in the new Windows 11 version there is no settings called "Message Synchronizing". 2. I was able to locate the file that contained all of my local files. I copied it to the new PC and directed Thurderbird to use this file. Works fine. 3. I have read the Help instructions for "How do I find my profile", "Moving a profile", Backing up a profile", Restoring a profile backup", Method using a transfer device", and "An alternative method for manual transfer between Windows 10 and Windows 11 computers".

As state above, my skill level is about a 3. When I start dealing with hidden files I am getting beyond my skill level.

My questions are: 1. Since Thunderbird seems to be setup and running, although not how I like, is it necessary to do the transfers described in the Help articles. Would I be over writing the manual setup I have completed when I compared the setup pages from the old and new PCs? 2. Can the files name for where the contacts are store be provided so I can manually copy over? I would think this would not be a hidden file. 3. How do I get the Windows 11 version to synchronize with the Comcast mail server? If the synchronizing occurs, will I get all of the "Sent" history or is this in a file that needs to be copied. FYI, the emails I sent from the Windows 11 PC has synchronized to the Windows 10 PC. 4. What are the settings for the Junk mail. The settings on the Windows 10 PC and the Windows 11 PC are the same. 5. Last but not least, how do I get the preview pane on the bottom. :-)

Thanks, and HELP!

Mike Jacks

I've usede Safari for years, but want to try Firefox. I've tried to import data, bookmarks and so from safari, but can't do it. Firefox says: Select the Safari file. But which one? And where do I find it? I've find the app Safari – but there's a lot of files underneath it.

Despite finding a search result for how to import bookmarks to firefox, I am unable to locate a menu on my Chromebook my Android device or my iPad which lets me locate and import bookmarks

Hi,

I have a very old 32bit computer with Windows 10 which has Thunderbird profile located in C:\Users\mbc0\AppData\Local\Mozilla Thunderbird

The new computer Windows 11 64bit has the profile stored in C:\Users\mbc0\AppData\Local\Thunderbird

The file structure also looks completely different, how do I move all my email/address books etc to the new installation please?

I have just downloaded the browser to both my iPad and iPhone 17. I do not have a desktop computer. I am trying to get my bookmarks from safari to populate into Mozilla on both my iPad and iPhone. How can I make this happen please?

Thanks

I have made under Win10 a backup file for Thunderbird: 140.3.0 (de)-2025-10-01.pcv. Now under Linux Mint I want to make update for Thunderbird, but the file *.pcv cannot be read. Please for help.

My old computer motherboard died. I was able to copy my profile from users>appdata>Thundrbird>Profiles. When I install Thunderbird on my new PC, I cannot find a method to install my old profile. I still have access to my old C:\ but only as an external data drive.

I have change to a new PC and i could not renember my password. I have to get acces to my account by a link to reset my passeword. After that I can not import my bookmarks to the new pc.

I am updating from an old iMac to a new MacMini.

My new macMini does not seem to like my old Thunderbird program so I have downloaded a current version. 

How do I transfer all my old email contacts and old emails to the new platform? I am, in no way, technically savvy so I need simple answers, Many Thanks, John

I have two accounts set up on Thunderbird. One new one with just the basic sub folders and an old one (no longer 'functional' due to failed service provider) which has many sub folders.

I have a multitude of filters on the old account directing incoming emails to appropriate sub folders and I want the same filters on the new account. Is there any way of just copying the old filters to the new account to save redoing each individual filter from scratch?

(Uptodate Thunderbird 144.0 (64-bit) on Win 10 desktop)

Any advice welcome Thank you