if i were to list out the top 5 ways to get and respond to email while on the go (and the respond part is important) , the list would look something like:
1. RIM Blackberry
2. Sony Ericsson P900/P900
3. Palm OS over CDMA/GPRS (various phones Treo 600, Samsung i500)
4. Microsoft Smartphone
5. Nokia Series 60
so the announcement from SE and RIM at 3GSM that the P900 will get a RIM email client only makes both those platforms stronger in my opinion. very cool. The RIM is a great email solution without many applications, and the P900 has plenty of applications without the full email experience of the RIM so seems like a good move to me as it will get licensing revenue for RIM and a better platform for SE. i really hope they go forward and bring this to market and this is more than just one of those press releases to get the competitive juices going and stock prices to move (and trust me, there's a lot of those).
nokia and RIM made a similar announcement last june to provide this capability on the Nokia 6800 a while ago for att Wireless, but i'm not sure anything ever materialized. Nokia seems to be placing their chits on getting to market first with EDGE and 3G/WiFi combo devices. It will be interesting to see how this plays out.