Migrating CMS content from one server to another

Hi everyone,

I have been working with a specific CMS system for a few years now and one 
aspect, which hasn't seem to improve is ability to merge one CMS environment 
into another. Specifically, what has been causing us problems is the CMS 
content migration part. In their defence, application migration is pretty 
straightforward with one of their proprietary tools. So I was wondering 
how/if so, do other CMS systems take care of this?

Thanks in advance.
Radmilo