[TYPO3-install] Typo3 ver. 4.2.12 on PHP 5.2.12 and MySQL 5.1.42 ?

[MT]

Hi all

I have a lot of "old" Typo3 websites running ver. 4.2.12.
My server software is about to be upgraded to PHP 5.2.12 and MySQL 5.1.42, 
for me to be able to upgrade all my Typo3 installations to the newest 
versions.

My fear is that the new versions of PHP (5.2.12) and MySQL (5.1.42) will be 
a problem for the old Typo3 4.2.12 installations?

Hope that somebody can help :)

- MT