64 bit Postgres 9.1 Limitions on Windows 2008 R2? When Deploying Postgres on Windows Server 2008 R2: 


Are there any limitations on windows that don't exist on Linux? 
Does the postgres scale in the same way on windows as it does on Linux?
Is performance on windows reasonably close to performance on Linux say within 10%?
No clue.
What kind of scale (up or out)? From what little that I've found on the web, it appears that Pg on Linux can handle more connections than on Windows.
Not if you are running anti-virus software on the Windows box ;^). There is an old (8.2 vintage) pgsql-performance thread here regarding performance differences. The take away seems to be "it depends" (based on usage) and that you need to do benchmarking to really know how much performance difference there will be. There is also some discussion regarding performance differences on serverfault.