UBB.threads PHP Forum Software Community Forums UBB.threads 7 Installation and Upgrade Support Mysql 4 -> 5 ? Gotcha

Are there any Gotcha's to be aware of when migrating a back up from a mysql 4 to a mysql 5

History :
I have been running Mysql 4.1 (I think)
and due to a cock up on my part my server is being re-installed.
Ive asked them if Mysql 5 can be installed, but are there any factors i need to be aware of or may catch me out?

Or should it be fine?

Thanks in advance Mark.