MS announced, that there will be no database available for 3rd party applications, like on windows mobile 6.5. Instead of using SqlServerCE the user shall use cloud computing or xml files to store data.
So I searched for alternatives, and found a very pretty proof of concept. This guy is using a modified version of csharp-SQLLite to manage a database in Isolated Storage. I tried it a few minutes ago, and although it has some performance issues yet, it’s working also with the beta release of Windows Phone 7 Development Tools.
Here’s the link: Mobile Development .
Thanks, Dan, you made my day!