This is how I've always done it (Windows). It preserves your whole existing setup.

Copy TB files from the old PC

- launch TB on the old PC

- go to TB menu > Help > Troubleshooting Information

- click the Application Basics > Profile Folder 'Open Folder' button

- the profile folder will open

- navigate three levels up to the AppData\Roaming folder

- close TB

- copy the AppData\Roaming\Thunderbird folder to a flash drive

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Skip to 'Paste the copied TB files to the new PC', as you already installed TB and created a profile.

Install and launch TB on the new PC, then start setting up the new profile.

- on the 'Set Up Your Existing Email Address' screen, enter name and email address only

- click the 'Configure manually' link

- scroll down and click 'Cancel'

- exit setup

- close TB

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Paste the copied TB files to the new PC

- open the AppData\Roaming folder like you did above

- delete the Thunderbird folder, or copy it somewhere if you want to save it

- replace it with the Thunderbird folder from the flash drive

- launch TB

I'm going to try this tonight. Question? I am trying to use d: drive and of course it puts profiles on both c and d. I'm about to just put it on c? Any ideas? Thank you.

I'm going to try this tonight. Question? I am trying to use d: drive and of course it puts profiles on both c and d. I'm about to just put it on c? Any ideas? Thank you.

You didn't mention wanting to use D:. In that case, you'll have to do it differently: simply copy the contents of the 'old' profile and replace the contents of the profile on D: with it. Don't do anything with local; that's all temp files and will be recreated.

Well again thank you. I install TB on the c: and transferred the data just fine. I wasn't trying to not give you all the info, just slow I guess? But I wanted to share space on the M.2. I am thinking about a bigger M.2? Not sure but heard memory prices may go up?? Thank you!