SQL CE4 public beta will be released

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http://weblogs.asp.net/scottgu/archi...h-asp-net.aspx

Replied by Scott, M$ is looking to enable it on silverlight.
I think this is also work in wp7 in future

Yes, I'm pretty sure it's among the things they wanted to do with it. Not only does it make a dead-simple database support for ASP.NET apps, but it also will be good for Silverlight as platform.

That way we can get a nice DB with a LINQ provider, that will be able to be scaled up on the *real* SQL Server when needed. A counter-reaction to sqlite being made available for Silverlight though Mono.

It also fits the whole concept with IIS7 Express very good

"That is something we are looking to enable as well in the future. Not there just yet though :)"

Sounds like "not anytime soon" to me.

The problem is writing a database is fully managed code is, well, difficult. Specially if you want it to be performant.

Also I think they might rather want us to use cloud service (read: Windows Azure) instead of a RDBMS, for our Silverlight and WP7 applications, if datastorage is needed. I believe you can expose a Azure Storage easily to WP7 using WCF.

The thing is that when we can't deploy any native stuff, microsoft can. They just need to provide a wrapper so it can be used from .NET