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The operating system's platform id is returned as Unix, however an enumeration value of MacOSX exists in the PlatformID enumeration.
With version of Mono Runtime:
Mono 2.10.9 (tarball Mon May 7 20:25:51 EDT 2012)
Package version: 210090011
On MacOSX Lion the following code snippet gives "Not MacOSX":
if (Environment.OSVersion.Platform == PlatformID.MacOSX)
See https://bugzilla.xamarin.com/show_bug.cgi?id=5453#c1 for a thorough explanation of why it's like this.
*** This bug has been marked as a duplicate of bug 5453 ***