Refer to the system tips for a
description of %USERPROFILE% thing; you will also need to adjust
Windows Explorer settings to show hidden objects - the
Application Data folder is hidden from view with the default system
settings.
XXXXXXXX.default - here X any letteror number.
Inside this profile folder you should find a subfolder for each your
mail accounts and another one for "Local Folders". Each of those
contains a bunch of files with the names matching your Thunderbird
folder names.
Each Thunderbird mail folder is stored in two files named after this
mail folder name:
File with no extension stores email messages in the plain text
format, one after one. This file is larger than the MSF index.
A corresponding (smaller) .MSF file contains mail
folder indexes and preference data. Thunderbird figures out
what part of the message to be displayed, the order of messages
within a folder, and the like - all based on the .MSF file information.
It is important to note that .MSF files do not contain any email
messages and, all in all, are redundant. Thunderbird will rebuild
.MSF files as needed if they are missing.
What are Thunderbird SBD folders?
Folders with a .SBD file type (extension) are designed for a subfolder
management; probably, SBD stands for SuBDirectory. SBD folders are used
to hold a hierarchy of mail folders. When you create a
new folder under some of the existing folder for the first time,
Thunderbird creates a .SBD folder to store email data of this child
folder. The folders are named
according to the parent folder to which a child belongs.
For
example, if you create a mail folder under "Inbox" folder, a
message database file and corresponding MSF file of this child folder
will be stored in the
The total size of all the emails stored in a single folder cannot exceed
4GB. This includes any items deleted after the last compaction took
place.
To compact a folder in Thunderbird, right click that folder and
select "Compact" from a popup menu. This should be done periodically
(once in several months perhaps).
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