This question came up on a forum I belong to, so I thought I'd pass along a couple of options for getting Hotmail on your Smartphone (note that both of these are subscription-based services):
  1. Pocket MSN (SmartPhone 2003 only): http://mobile.msn.com/ - Free trial for 6 months, then $24.99 per 6 months.
  2. IzyMail Online: http://izysoft.com/ - Subscription costs are based on the number of addresses you wish to support with the service.
Note that I haven't tried either of these services, but since they came up in the discussion, I thought I'd share them.