The N95 is a great gadget but it's limited as a business phone. It's too delicate, the wrong shape, and its software is of limited use for email sync.
Blackberrys are all good and nice, but their problem is that you only have very basic OTA email, no proper over-the-air sync with your mail system for calendaring, read/unread status, sent items etc, until you agree to a ~£35/month BES tariff, and install BES or BPS (1 user free BPS, so I have done a few of those now) onto your back-end mail system.
The idea of just 'doing it yourself', rather than relying on a different tariff & provisioning, blackberry servers etc, is one that I like a lot, so provided you have an Exchange server (2003 onwards), the Windows Mobile system (Exchange ActiveSync) ticks all the right boxes for me, alongside something like T-Mobile web'n'walk to cover the data usage and then some, however there is one problem, and that is that..
Windows Mobile sucks. It doesn't do a good enough job of being a phone, and it's very much like jumping back to Windows 3.1 in terms of how modern it feels.
But there is light at the end of the tunnel..
Not enough people seem to be aware that you can do this 'blackberry type stuff' with a Nokia business smartphone (that'd be E-series then, of which E51 is the cream of the crop IMO, 3.5G HSDPA, wifi, fast CPU, acceptable battery life etc.). Nokia's free Mail for Exchange application speaks 'Exchange Activesync' with the Exchange servers. There are tons and tons of people out there who also prefer the "direct data-connection to your servers" approach, rather than the Blackberry approach, but think that this means they have to have a sucky Windows Mobile PDA-cum-halfphone.
The Nokia 6310 was every business man's favourite phone.
http://www.mobilesdata.com/images/big/Nokia/6310.jpg
The Nokia E51 is, in my opinion, the smartphone equivalent of that.
(almost everybody seems to not like it in pictures, but love it once they pick it up..)
http://www.3g.co.uk/PR/Sept2007/E51.jpg