3 months after passing 70-341, I have passed 70-342 and completed my MCSE.
Personally, I found the 2 exchange exams easier than the 3 windows server exams. It just seemed to make more sense to me, and I think the fact it is more focused than the windows server ones, the windows server ones were much more broad than the exchange ones. I also think it is because the exchange content seems more relevant, stuff like VPN in the windows server exams seemed a bit pointless; it is most likely something that not many people would use with stuff like checkpoint, cisco etc available. And even if you did go with this, it would most likely be the network guys that would deal with it.
Now I need to figure out where to go next. May aim for another MCSE at some point, I think communication would be the best one to go for and would make more sense to follow on from Exchange. I am going to take a well earned break for a while though before I move onto something else!