Today has been a bit of whirlwind. In my search for a MAPI adapter I found out that Kayxo went out of business recently and their Exchange BizTalk adapter no longer exists as a buyable product. No wonder I did not get a response from them by email. This also explains their poor website. Perhaps I missed a Business Week or a USA Today article but I can honestly not find very good information on their closing. If you want a copy of the download, just let me know.
Also, I found out that iWay does not sell BizTalk adapters. If you look at their website they look like an adapter provider but I found out today they do not actually sell native adapters. For example, take this page: http://www.iwaysoftware.com/biztalk.html, it all looks like the adapters are BizTalk adapters. In the past I had definitely recommended iWay as a BizTalk adapter provider but I heard today they sell a competing integration platform and do not actually provide BizTalk adapters.
So the MAPI adapter search is definitely dead now, I will have to build one. Please let me know if you know of another MAPI adapter provider.