Hi Raghav,
ColdFusion 6.1 is not supported with Windows 2008 server. Though you can migrate your current application from CF 6 to CF 10 and CF 10 is compatible with Windows server 2008 and 2012.
You can run the Code Analyzer which can give you all the possible tags which was deprecated and will give you the options which you replacement for those tags.
Thanks,
Priyank