Outlook 2003  Outlook 2007  Outlook 2010 
Exchange 2003 (SP2)  Outlook Anywhere
RMS e-mail
Cached mode
Reduced Network traffic (50-70%)
Search Folders
       
Exchange 2007 (SP1)  Outlook Anywhere
RMS e-mail
  Managed Folders
  Sender ID Anti-Spam
  AutoDiscover Settings
Cached mode
Reduced Network traffic (50-70%)
  Server Search
Search Folders
  Resource Booking Attendant
  Schedulable OOF
  Internal/External OOF
  Voice Mail
  Scheduling Assistant
  Share Calendar Information
  Calendar Attendant
       
Exchange 2010 (RTM)  Outlook Anywhere
RMS e-mail
  AutoDiscover Settings
  Managed Folders
  Sender ID Anti-Spam
    Protected Voice Mail
    Message Tracking
    Retention Policies
    Email Moderation
Cached mode
Reduced Network traffic (50-70%)
  Server Search
    Larger Mailbox Support (performance and cost)
Search Folders
  Internal/External OOF
  Voice Mail
  Scheduling Assistant
  Share Calendar Information
  Scheduelable OOF
  Calendar Attendant
  Resource Booking Attendant
    SMS Sync
    SMS reminders
    Meeting Room Finder
    Categorize Conversation
    Contacts Sharing
    Quick Steps
    Conversation View
    MailTips
    Ignore Conversation
    Move Conversation
    Calendar Sharing (Federated) 
    Voice Mail Preview
    Archive Access
    Distribution Group Creation