You can however still open databases on the server to which you have access. Just right click on the server in the Server Navigator and select Open Database. This will prompt you for the name of the database to open. Open the Options Window and on the View tab uncheck the Show Primary Key Warning. Mascon warns you of this because when updating a table that does not have a primary key you may get unexpected results.
Lets look at the following sample.
Take the following table as an example. This table does not have a primary key. Now there will be two records in the table with a Pete McKensey age 44 record. You should notice that the data in this table has now become inconsistent in that the first and third records have exactly the same values and there is no way to distinguish the two from each other. This is the reason why Mascon, in previous versions, required a primary key for updating tables.