I have SQL Server 2016 Express (13.0.4199.0) and my SSMS is 13.0.16106.4
I searched my PC (name Beethoven) user objects and found 20 SQLEXPRESSnn users as follows:
Who are they and can they be deleted?
I was actually looking for the usual MSSQL$SQLEXPRESS account but it's not there. Have things changed?
