Must have features
PDA support
Integrate with office suite
Integrate with LDAP
Support and user
documentation
Easy migration path
Spell-check for email
Anti-spam features
Instant messaging
compatibility
Print daily calendar
No loss of features relative to
   Exchange
Real-time interaction for
   meeting planning
Strong address book features
Reliability, reliability, reliability
Calendar sharing
Multiple access modes (PC,
   Mac, PDA)
Support for attachments
Bulk account creation