Upgrading Apache, PHP & MySQL

I am currently running Apache 1.3.34, PHP 4.4.1 and MySQL 4.0.25

I am in the process of getting a new server and am just wondering what problems I might encounter when upgrading and moving sites across.

On my new server I would like to install Apache 2.2.0 PHP 5.1.2 and MySQL 5.0, but have heard a few problems of getting the latter two to work together.

So should I use all the latest versions? and should moving sites be a pretty painless experience?

 

 

 

 

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