- no access to public or shared folders and resources (did someone mention IMAP and LDAP/ADS?)
- no sane IMAP client with LDAP/ADS support to work around that limits
- keys are too small to type (landscape instead of portrait anyone?)
- display is too small for longer reeading (landscape instead of portrait anyone?)
So basically it's too big for a nice phone and too small/to bad designed for typing and reading mail while the software has major limitations.
If the Nokia Communicator wasn't so thick I'd go for that one.