SQL Server Management Studio will store the names of the servers you have connected to so that you can easily connect at a later date without having to re-enter the IP Address or name of the server. This is a great feature but sometimes my list gets populated with a bunch of servers that I don’t use frequently. Unfortunately, there is no tool that can be used to clear out the list. Luckily there is still a way to accomplish this. Just navigate to the corresponding directory below, depending on your operating system, and delete the SqlStudio.bin file.
C:\Documents and Settings\[User Name]\Application Data\Microsoft\Microsoft SQL Server\100\Tools\Shell
C:\Users\[User Name]\AppData\Roaming\Microsoft\Microsoft SQL Server\100\Tools\Shell
After deleting the SqlStudio.bin file, the list will be cleared.
SQL Server Management Studio 2005 Users: If you are using SQL Server Management Studio 2005 then the file you will delete is named mru.dat. Further, to find the file replace 100 with 90 in the above file paths.