Well, you might check this
UBB 5.x to phpBB 2.x Converter
http://www.phpbb.com/phpBB/viewtopic.php?t=70989
http://gui.mafmods.com/projects/phpB..._converter.zip
QUOTED FROM THE ABOVE PAGE:
Quote:
Installation
1. Copy the "convert" folder to the root directory of your phpBB folder.
2. Make the config.php file world writable/chmod 777.
3. Point your browser to the url of the convert folder (ie. http://www.example.com/phpBB2/convert/), fill in the needed information, and hope for the best.
Additional Notes
* For the time being, this script requires PHP > 4.0.4, due to the usage of PEAR DB. I might eventually make a switch to phpBB's database implementation since that seems to be more compatible.
* Successfully converted versions (please let me know if you've converted others): 5.45c, 5.47a, 5.47d, 5.47e
* A big thanks to Paul Daniels for the "incentive" to finish this converter and for all the initial beta testing.
* If you run into any problems, debug mode may be turned on by changing the variable $debug from 'no' to 'yes' in prefs.php
* As of version 1.0.4 sequences are updated for PostgreSQL. Other supported databases also use sequences, but I'm unaware of which ones. If your database uses also uses sequences, let me know and I will implement it into the converter.
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Doesn't sound too pleasant to me,,,,, make sure you backup your database BEFORE you mess with it..... (you probably knew that, but I thought it should be mentioned).