I'm almost compelled to shout that it doesn't work and won't ever work! ..humor aside, why wouldn't it work? Microsoft spends a lot of money in making sure that the most popular applications keep working when you upgrade. (Be that from W2k to XP or XP to Vista) I are troll :)

For Crystal Reports 2008 it is not supported. Nested Subreports is not acceptable. Not sure for other versions. Sorry pal. Always keep the Murphy Rules in mind!