CentOS 4.x to 6.x upgrade affects MailScanner?

[tuxg]

Hi,
Does this OS upgrade on VPS affect the functioning of MailScanner in anyway? Any precautions that need to be taken?
Thank you.

[Sarah]

We have had a few customers who had to reinstall MailScanner after an OS upgrade. Not sure why this is, may be a problem with the upgrade procedure. There is no issue with MailScanner with CentOS 6 itself.

[tandyuk]

CentOS themselves DO NOT recommend upgrading anything below 6 to 6.0+
Their official release notes state:

Upgrading from CentOS-4 or CentOS-5:
We recommend everyone run through a reinstall rather than attempt an
inplace upgrade from CentOS-4 or CentOS-5.