Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Eheka Pytyvõha

Emboyke pytyvõha apovai. Ndorojeruremo’ãi ehenói térã eñe’ẽmondóvo pumbyrýpe ha emoherakuãvo marandu nemba’etéva. Emombe’u tembiapo imarãkuaáva ko “Marandu iñañáva” rupive.

Kuaave
Ñongatupyre

A newer version of Thunderbird may have made changes to your profile which are no longer compatible with this older version.

Wayne Mery ombohovái
JayinOK

A newer version of Thunderbird may have made changes to your profile which are no longer compatible with this older version. Use this profile only with that newer version, or create a new profile for this installation of Thunderbird. Creating a new profile requires setting up your accounts, calendars and add-ons again.

More information…

THIS NEEDS AN OPTION TO CONTINUE USING OLD PROFILE. YOU JUST MADE THUNDERBIRD USELESS TO ME. DO NOT KNOW HOW TO CREARE A NEW PROFILE. SHOULD NOT NEED TO. CAN NOT START IT AFTER MANY YEARS OF USE. PREFERRED OLD VERSION OF ABOUT 5 YEARS AGO. JAY

A newer version of Thunderbird may have made changes to your profile which are no longer compatible with this older version. Use this profile only with that newer version, or create a new profile for this installation of Thunderbird. Creating a new profile requires setting up your accounts, calendars and add-ons again. More information… THIS NEEDS AN OPTION TO CONTINUE USING OLD PROFILE. YOU JUST MADE THUNDERBIRD USELESS TO ME. DO NOT KNOW HOW TO CREARE A NEW PROFILE. SHOULD NOT NEED TO. CAN NOT START IT AFTER MANY YEARS OF USE. PREFERRED OLD VERSION OF ABOUT 5 YEARS AGO. JAY

Moambuepyre Wayne Mery rupive

Opaite Mbohovái (2)

Open a Run window (Windowskey+R), enter

thunderbird.exe --allow-downgrade -p

select the old profile.

Jay, your old profile is probably still there. See https://support.mozilla.org/en-US/kb/profiles-where-thunderbird-stores-user-data#w_finding-your-profile-without-opening-thunderbird for a description of how to find the directory names.

In Windows' list of installed programs, what version(s) of Thunderbird are shown as installed?