If you launch the Thunderbird on JAIST Cloud Desktop, you might will be forced to create a new profile.
In such situation, please refer to the following steps to fix the problem.
step1.
Close Thunderbird software.
step2.
Windows10: Type the following command in search window to open Thunderbird Profile Manager (a DialogBox "Thunderbird - Choose User Profile")
thunderbird.exe -p
Windows7(64bit): Press start button and copy & paste the following command in "search program and files" window.
C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe -p
Windows7(32bit): Press start button and copy & paste the following command in "search program and files" window.
C:\Program Files\Mozilla Thunderbird\thunderbird.exe -p
step3.
select "default" profile and run Thunderbird.