Thank you for your interest in the Sitefinity 4.0 Beta.
The beta version of Sitefinity 4.0 can work only with MS SQL Server or SQLExpress. However we plan to support all databases that are supported by the OpenAccess ORM. Unfortunately if you develp a website on one database and you wish to transfer to another you would have to use a third party tool to convert the db from MSSQL to MySQL for example.
the Telerik team
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