[edd]

You can very easily plug a mac in to an exchange based organisation. I know I have plugged one in to what was the largest exchange install outside of Microsoft's own campus. You can very easily make it map on to Active Directory, mount your Active Directory home folder and even use all of the exchange email and calendar functionality using office for mac. The reason organisations aren't switching from xp is because they trust it, its stable and it can do everything they need their users to be able to do.

[electromagnetic]

All my interactions with Mac (I'm a windows user, my brother got a fair dose of Macintosh fever a few years ago) have been exceptionally easy.

I never had a problem connecting the computers, the biggest problem was that file types weren't compatible. However, with any incomparability problems I just went the old fashioned way of RTF and CSV to get the job done.

For everything else, well there's always Boot Camp.