Does running a SQL Server 2005 database in compatibility level 80 have a negative impact on performance?

Question

Our software must be able to run on SQL Server 2000 and 2005. To simplify development, we\'re running our SQL Server 2005 databases in compatibility level 80. However, dat

Answer 1

Also a FYI, if you run compatibility level 90 then some things are not supported anymore like old style outer joins (*= and =*)