[NTLDR]

As far as I know there isn't a converter out there, not one that will do the whole job!

I don't know if there is a tForum --> phpBB if there is the long way about it would be to convert tFroum --> phpBB then phpBB --> vBulletin

Here is the best info I could find on any converting (of thereads and posts only):

Yesterday night I finally finished converting my tForum to vBulletin. I wrote a php script to transfer the posts / threads form the tForum database to the vBulletin database (for increased difficulty, I have two seperate databases ).
You must have transferred the user database which should be a cakewalk using phpMyAdmin.

To use this script and transfer your databases, do the following:

1. Check the ForumID of the source and target forum.
2. Modify the transfer.php script by changing database, username, password, source and target board ids, and the userIDs in the 'IF' - section.
3. Point your browser to the script. If you didn't get any errors, everything should be fine.
4. Repeat step 1.-3. for every board you want to transfer.

I know the script is kinda akward to use and it could of course be much more comfortable, but it became late yesterday, I was tired and not motivated enough to make this script nicer to handle. Sorry
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(Import Scripted As Attachment)

Hope this is of some help!