Visual Studio 2010 vs Visual Studio 2010 Express file and entity model

Question

Can I open a solution saved by VS 2010 Professional in Visual Studio Express and vice versa?

If so, will there be problems with the entity model (edmx)? Here I see the following statement:

Visual Studio Express Edition cannot connect to the server. They can only connect to an instance of a database file.

http://msdn.microsoft.com/en-us/library/bb399247.aspx

Thank.