Are Visual Studio 2010 Professional Solutions/Projects 100% compatible with Visual Studio 2010 Premium Solutions/Projects?

I am just wondering on what version of Visual Studio 2010 to install (Professional or Premium) If there are a few people in the team with a mix of VS2010 professional/premium, would opening solution/project files be an issue, ie incorrect version or prompts to upgrade prjects..

Projects include: asp.net mvc, database and silverlight.

What is the special features of Visual Studio 2010?

New Features and Enhancements in VS2010enhanced support for multi-targeting. support for call hierarchy of methods. support for parallel programming and debugging. support for XSLT profiling and debugging.

How do I know if Visual Studio 2010 Service Pack 1 is installed?

Help -> About . The version of the installation will be SP1Rel if SP1 is installed.

In general projects created by the same version of different editions are compatible with one another - if the edition installed lacks features necessary to load a given project, it will inform you of such and simply not load the project.