How to disable Thunderbird mozmsgs

Mozilla Thunderbird has an option to integrate with Mac or Windows email search.
Using this option the emails are no longer stored in the SDB files (many emails in a single file) are stored in multiple and individual files.
This usually results in poor performance, especially if you have many emails.

To disable this option, go to 'Options', 'Advanced', 'General' and unselect the "Allow Windows Search to search message".
You can also unselect the "Enable Global Search and Indexer" option if you do not use the global search.

Change account ordering in Thunderbird

To change the order of Thunderbird email accounts in the left panel proceed as follows:

1 - Open Thunderbird. Make note of current ordering of accounts. Close Thunderbird.

2 - Explore C:\Documents and Settings\%USERNAME%\Application Data\Thunderbird\Profiles\
(%USERNAME% will be automatically replaced by the current user's name by Windows Explorer)

3 - Edit prefs.js, find the following line:
user_pref("mail.accountmanager.accounts", "account1,account2,account3");
The comma separated list dictactes the account order.
Change the order to your liking.

4 - Restart Thunderbird and check results.

Source: Lego's Land blog post