What versions of SSMS have an Express edition?
The SSMSE was different in what it can manage as documented here.

Now you can use SSMS (SQL Server Management Studio) as a seperate download - SSMS or SQL server 2014 express - SSMSE that will manage all editions of sql server.

Aaron has a really good explanation here with screenshots :-)


  Express version of Management Studio, since 2012 Service Pack 1, has been a fully functional product with absolutely no differences