You should not disable the guest user in the msdb database in Microsoft SQL Server 2008, 2005 all editions
SQL Server Books Online recommends that you disable the guest user in every SQL Server 2008 and 2005 database as a best practice for
securing the database server. This recommendation does not apply to master, msdb and tempb system databases as described in this
Published : 2014-01-30.
Last updated : 2020-10-31.
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