To activate Maildir in Thunderbird
To use folder size > 4 GB in Thunderbird,
You can set mail.serverDefaultStoreContractID = “@mozilla.org/msgstore/maildirstore;1” in tools ->preference -> advanced -> general -> config editor to use berkeleydb for new accounts. [This feature is experimental. so backup data].
Thunderbird preference
configuration editor Thunderbird
key to change
So next time if you create a new account, storage of mail will be in maildir format.
Default is “@mozilla.org/msgstore/berkeleystore;1”, which is mbox.
Categories: Technical
folder size, greater than 4GB, inbox, maildir for thunderbird
Jaise James 's Blog 
Useful post Jesse…but probably worth mentioning that the functionality will not hit until Thunderbird 12. Perhaps “To activate Maildir in Thunderbird 12”
Just for anyone else…At present, April 2012, the backend functionality is in Thunderbird 12, but there is no GUI to configure MailDir, hence the manually must be performed configuration
A useful bugs to watch…
https://bugzilla.mozilla.org/show_bug.cgi?id=58308
It will be great when maildir support in TB12 reaches the stable release channel. It will be even better with a GUI and migration tools from berkley to maildir.
In Thunderbird 17.0.5 for Windows, Maildir is still full of bugs and will cause lost messages and move/copy/import mails can end up with totally corrupted folders.
yes, you are right. I tried filters. it will filter message, but won’t show in folder,. We need to repair folder to list filtered messages.
> (IstvanK) In Thunderbird 17.0.5 for Windows, Maildir is still full of bugs and will cause lost messages and move/copy/import mails can end up with totally corrupted folders.
> (Jaise) yes, you are right
Jaise, This feature is rather worse than experimental. I think you should edit your blog post so that unsuspecting users don’t try it.
This did nothing for my imap mail storage. It’s all still msf files still, and I created my imap account settings after configuring this.
I have the same problem. The files are all msf for my imap.
Hey, thank you for the article.
I’m having issues with cpanel exported emails to thunderbird, buit hopefully I can solve the issue!