General Email Question

Hi,

I'm looking to purchase a PDA in the near future and my biggest concern is being able to sync to multiple email addresses (minimum 2).  Does anyone have any advise on the best PDA for this and whether you can sync to email addresses that don't use outlook (i.e. hotmail)? 

Is there a difference between the PalmOS and Pocket PC for this?

Any help is appreciated.

Thanks.