It's also not recommended to run UBB.C 6.5 due to the security issues; I know a lot of webhosts who disable sites for refusing to upgrade when the owners KNOW of security issues within the software and just don't feel like upgrading.
You know, when I worked at the webhost several years back, and we where the main contributer for a cms system, we sent out update emails to every client when there where some severe upgrade warnings...
Users who refused to upgrade when they where warned where at times suspended, or termed on the spot for violating the AUP for not keeping their webspace secure (these users where generally warned several times)... Those who we didn't term, where quickly hacked and begged for assistance, it was quite entertaining...
