Thunderbird Restore from backup
BACKUP
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How to backup Thunderbird
type in search box "%appdata%
C:\Users\xxxx\AppData\Roaming find thunderbird folder
click to thunderbird then click Profiles
now path files eg. C:\Users\xxxx\AppData\Roaming\Thunderbird\Profiles
copy Profile folder eg. exn8i7kd.default to any new location folder for your want eg. D:\thunderbird-2 eg. D:\thunderbird-2\ exn8i7kd.default
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RESTORE
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Thunderbird Restore from backup
Start type in search box "thunderbird.exe -p"
Create Profile click Next change Name for your want to use
Chose Folder and browse to D:\thunderbird-2 then choose exn8i7kd.default
close app then start thunderbird
Finished
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