Microsoft Windows, starting from version 2000 (formerly known as Windows NT 5), implements Kerberos 5. Their implementation, however, has some quirks, peculiarities, and bugs. This chapter is a short summary of the compatibility issues between Heimdal and various Windows versions.
The big problem with the Kerberos implementation in Windows is that the available documentation is more focused on getting things to work rather than how they work, and not that useful in figuring out how things really work. It's of course subject to change all the time and mostly consists of our not so inspired guesses. Hopefully it's still somewhat useful.