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Migrating a Thunderbord Profile from Windows 7 (32-bit) to Windows 10 (64-bit)

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I have installed Windows 10 in a new partition,and one of the last things I have to do is to get Thunderbird profiles set. I have not yet set up Thunderbird, so I have in Appdata\Roaming\Thunderbird\Profiles:

    qaqkee8x.default
    v73kxnlg.default-release

My profile in Windows 7 is qf00ka5x.default . In the Profiles directory I renamed the default profile by appending "-old". Ten I copied (via xcopy) the qf00ka5x.default directory from Windows 7 to Windows 10. Now I have in the Profiles directory:

    06/30/2020  03:49 PM    <DIR>          .
    06/30/2020  03:49 PM    <DIR>          ..
    04/06/2020  09:21 PM    <DIR>          qaqkee8x.default-old
    06/30/2020  01:11 PM    <DIR>          qf00ka5x.default
    06/29/2020  08:54 PM    <DIR>          v73kxnlg.default-release

When I start Thunderbird with -P, I see two profiles in the "Choose User Profile" pop-up window:

    default-release
    default

If I click on "default-release", Thunderbird opens and asks me to set up the account. If I click "default", then I get a pop-up window with the error message, "Your Thunderbird Profile cannot be loaded. It may be missing or inaccessible."

Four related questions: 1) Why are there only two profiles listed in the "Choose" window, when I have three profiles there? Is it because I have appended "-old" to one profile name?

2) When I click on "default", which profile is being loaded and failing? Is it my qf profile or the "-old" profile? If it is my qf profile, how can I determine what is wrong with that profile?

3) I also have profiles in Appdata\Local\Thunderbird\Profiles. I did copy my Local qf files from Windows 7 to Windows 10, but I am not sure what is the purpose of this Local Profiles directory.

4) Until I get this problem resolved, can I go back to Windows 7, run Thunderbird, and auto-synch my qf profile between Windows 7 and Windows 10?

This is Thunderbird 68.9.0 .

Thanks.

I have installed Windows 10 in a new partition,and one of the last things I have to do is to get Thunderbird profiles set. I have not yet set up Thunderbird, so I have in Appdata\Roaming\Thunderbird\Profiles: qaqkee8x.default v73kxnlg.default-release My profile in Windows 7 is qf00ka5x.default . In the Profiles directory I renamed the default profile by appending "-old". Ten I copied (via xcopy) the qf00ka5x.default directory from Windows 7 to Windows 10. Now I have in the Profiles directory: 06/30/2020 03:49 PM <DIR> . 06/30/2020 03:49 PM <DIR> .. 04/06/2020 09:21 PM <DIR> qaqkee8x.default-old 06/30/2020 01:11 PM <DIR> qf00ka5x.default 06/29/2020 08:54 PM <DIR> v73kxnlg.default-release When I start Thunderbird with -P, I see two profiles in the "Choose User Profile" pop-up window: default-release default If I click on "default-release", Thunderbird opens and asks me to set up the account. If I click "default", then I get a pop-up window with the error message, "Your Thunderbird Profile cannot be loaded. It may be missing or inaccessible." Four related questions: 1) Why are there only two profiles listed in the "Choose" window, when I have three profiles there? Is it because I have appended "-old" to one profile name? 2) When I click on "default", which profile is being loaded and failing? Is it my qf profile or the "-old" profile? If it is my qf profile, how can I determine what is wrong with that profile? 3) I also have profiles in Appdata\Local\Thunderbird\Profiles. I did copy my Local qf files from Windows 7 to Windows 10, but I am not sure what is the purpose of this Local Profiles directory. 4) Until I get this problem resolved, can I go back to Windows 7, run Thunderbird, and auto-synch my qf profile between Windows 7 and Windows 10? This is Thunderbird 68.9.0 . Thanks.

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I solved my problem. I had not updated the Profiles.ini file to add the copied profile name. Once I did that, I saw my copied profile as the default profile. I still do not understand why, when I have three profiles now, I see only two when I start Thunderbird with "-P".