[eluser]Unknown[/eluser]
I know this topic has been dead for a long time, but I wanted to help some people out if possible. I ran into issues with CI and MSSQL and after a long and hard search found that CI can handle MSSQL natively if you insure you server has php5-sybase installed. This currently works for both MSSQL 2000 and 2005 using CI 1.7.6. I hope this can help end hours of frustration for someone else out there.
~bigboyfuge
"If home is where the heart is, is a heartless person homeless?"