How do I migrate the contents of subfolders [e.g. 'sent'] to a new system?

Question

MozBackup transferred the profile, which included the subfolders [e.g. 'Sent"] and the NAMES of the files in those subfolders [e.g. 'Back2Basics"], but when I open a file, I see nothing of the content. How do I get/see/migrate the content?

Answer 1

Info on manually copy of Profile or specific files.
'''Locate Profile:'''
On old and new computer:
Make hidden files and folders visible:
* http://kb.mozillazine.org/Show_hidden_files_and_folders
On Old computer:
Locate the Profile.
If you have Thunderbird on old computer
* Open thunderbird
* Help > Troubleshooting Information
* click on 'show Folder' button
* a window opens showing your Profile folder
* Close Thunderbird now - this is important
If you you do have Thunderbird installed, you can locate the directory here:
* C:\Documents and Settings\Windows user name\Application Data\Thunderbird\Profiles\Profile name
more info on Profile folder:
* http://kb.mozillazine.org/Profile_folder_-_Thunderbird
The Profile folder will contain a 'Mail' folder amongst others.
See image below to see what it should look like.
These are all the files and folders that are IN your Profile on old computer.
'''If you want to get a full copy of this profile onto new computer.'''
Copy all of the files and folders onto a flash drive
Do not copy the actual Profile name folder - only contents of that folder.
locate Thunderbird Profile on new computer
either via Thunderbird - see info above and remember to close thunderbird
or
locate this directory:
C:\Users\Windows user name\AppData\Roaming\Thunderbird\Profiles\Profile name\
Paste all files and folders INTO the Profile name eg: xxxxxxxx.default
over writting all the current files and folders.
'''If you only want to locate specific folder(s) containing emails and move them to a new profile that already has a mail account:'''
In the old profile on old computer
* Click on 'Mail' folder
* click on mail account name
* Look for 'Sent' file (no extension)
* Copy this file to flash drive
On new computer locate profile folder
* click on 'Mail' folder
* click on mail account name folder
* Paste the file into this location overwriting the current 'Sent' file.
* Delete the 'Sent.msf' file - this is just an index of what is in the Sent file and will be recreated when you open Thunderbird.
Open Thunderbird.
Info on 'Move to a new pc':
* http://kb.mozillazine.org/Move_to_a_new_PC