I'm sure you will be convinced after reading this.. I'v been using Windows Mobiles for quite some time now so please don't think that its a biased answer. Finally E71 is the answer to switch over from years of Windows Mobile frustrations. Now I need a very very strong reason to go back to Windows Mobile. Answers to your questions below..
1. Microsoft Exchange mail works flawlessly. As a matter of fact my phone beeps first when an e-mail arrives and after few seconds, my outlook on the PC connected to LAN pops up the mail. I feel its cool. I just tried sending a calendar invite but there is no "To.." option. Maybe I'm missing something. It doesn't bother me.. If I have to setup a meeting, I can log onto outlook web access and do it from there if need be but its not a showstopper. I can get meeting invitations thats for sure..
2. Internal GPS is very good. You can use Google Maps or Nokia's built in maps. Tomtom needs an external GPS as for some reason it doesn't pick up the internal GPS. Heard that there are other GPS navigation softwares that work with the internal GPS. Tomtom on E71 is million times better than Windows version. It doesn't hang! It works when you need it the most.
3. I've been using Windows molbiles since the beginning of XDA II days (is it 5 or 6 years now?). With every upgrade I seach for alternate phones every year and end up buying a windows mobile again which lasts for few months before having some problem or the other. Finally E71 is the answer to that. I need a strong reason to go back to Windows mobile now. This is one of the best phones I ever used despite its minor issues. It has so many positives that the negatives can be easily forgotten when you have this baby in your hands. Just go for it!
4. Not sure about the automatic time zone switching as I take 10 mins to travel to work! 😎 I did see an option to change the time based on the network. Worth checking the manual on Nokia site to get confirmation. Nokia can't be that stupid!
5. I think you shouldn't be asking that question. There is a world of difference between Windows mobile and Symbian. I forgot what reset means! E71's build quality is probably on par or better than iPhone.
6. Recharging over Mini USB is a problem if you compare it WM phones. No doubt. But if you compare its battery life with WM phone, I gues you don't even need to recharge at work. My WM used to die by afternoon with mail continously synching and constant phone calls. This one lasts with the same usage till the next morning's recharge. It costs �10 to buy a tiny USB recharge cable.
7. It didn't work on my vista laptop. I guess its a matter of waiting for few more months for a better s/w upgrade for vista. So its a no. But USB works..
8. You can specify the intervals of mail retreival and the connection it needs to connect to.
9. Adjust the profiles accordingly. I guess you should be able do. Good thought actually. I'll give it a try!
10. I think you can't sync with a desktop if its sync with OTA exchange server. But why do you want to do that? Fire up your WLAN and sync. Job Done.
I spent �330 on a sim-free phone. After that 3 launched at a cheaper rate. I don't regret spending extra 100 quid after 2 weeks of use! It took few days (like looking for similar apps/features I was used to etc..) to get used to it but now I just love it...
Hope this helps!