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>>If you are downsizing because of cost, you can move down to MSDE which has been desribed as a light version of SQL Server. MS marketing says "It requires no coding changes" to move between MSDE and SQL Server. Only supports 5 connection though.
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>How do I move a database from one type of backend to another? Are there tools to do this?

Upsizing yes, downsizing no.

If you coded using classes or COM to access your database it might have been easy. Otherwise you have some work to do.