vBulletin is not a hosted only community solution - when you purchase a license, you will be able to download the software and install it on any server that meets their system requirements.
Minimum Requirements: vBulletin is designed to run on every server that has PHP 4.3.3 or greater and MySQL 4.0.16 or greater installed.
It is recommended to use PHP 4.4.2 or 5.1.2, or later and MySQL 5.0.19 or later.
The software has been successfully installed on several different flavours of UNIX, as well as Windows™ 98/NT/2000/XP, and the Mac
Note: I recommend you contact your hosting provider to verify that they have the correct versions of PHP and MySQL installed. If you administrate your own server, PHP and MySQL are available for free download from php.net and mysql.com.
vBulletin is only compatible with the MySQL database system.
vBulletin 3.7.x
The vB3 import system is called ImpEx and currently can support the conversion of the following boards to vBulletin:
IPB (2)
phpBB 2.0.x
Infopop eve
IPB (1.1 -1.3)
IPB (2.x)
wBB (2)
Ubb classic (6.3 - 6.7)
Open Topic & Ubb.x
DCFm (DCForum+ MySQL backend)
YaBB SE
Ubb threads
vBulletin (2)
vBulletin (3.0, 3.5 and 3.6)
Snitz (MySQL)
Ikonboard MySQL
XMB
CuteCast
ThwBoard (3)
SMF
DiscusWare (file based - 4.00.x)
vB (1.0 RC1)
YaBB - Gold
openBB
dulexportal
Digiposts
Phorum
Fusetalk
WebWiz
Ezboard (posts only, not members accounts)