Upgradeing PHP/MySQL Question

[ccds_tally]

I need someone to confirm this: my hosting provider (I won't mention names) claims that the following setup is not compatible:

They have Plesk 8.0.1 and Apache 2.0.52-22

Upgrade PHP 4.4.2 from 4.3.9
Upgrade MySQL 5.0.22 from 4.1.12

This is a VPS running under Virtuozzo so their are no other clients to consider.

I just wanted to know if this is true, because I've been having my doudts with these people lately.

Thanks in advance,
Brad