default windows authentication is greyed out, how can i change to be abled to
allow use different windows authentication id to login ?

DD (DD (AT) discussions (DOT) microsoft.com) writes:
You can't. The whole point with Windows authentication is that Window
has already authenticated you.

What you can do, though, is to is to use Run As in Windows and start
SSMS this way.


--
Erland Sommarskog, SQL Server MVP, esquel (AT) sommarskog (DOT) se

Links for SQL Server Books Online:
SQL 2008: http://msdn.microsoft.com/en-us/sqlserver/cc514207.aspx
SQL 2005: http://msdn.microsoft.com/en-us/sqlserver/bb895970.aspx
SQL 2000: http://www.microsoft.com/sql/prodinf...ons/books.mspx