Changing a Content Management System

I have a potential customer that is looking to change their content management system.  I'm not even sure which questions to ask.  Can anyone give me a list of things to consider when changing a Content Management syste?
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Peter HartCommented:
first ask the cusomter hwhy they want to change - then use te answers to find a good CMS plus these:

1) ongoing costs  (monthly, what about updates)
2) training
3) system requirements needed to support the CMS  - does it work on MACs and PCS
4) ability to go back to previous edits

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