Pro

The PRO version includes all Basic version features, plus:

• Message Archive Options Manager
  Modify other account's message archiving options directly
• Command-line Interface
  Decode as many files as you can or make automated scripts without messing with the user interface
• Saved Password Recovery
  Recover the password saved when a user logged in
• Decode ALL messages with just one click
  Back-up messages and find missing information in a minute
• Free upgrades
  No upgrade cost for new versions!

Basic

Just some main features:

• Super-Fast Decoding
  Decode Private Messages, Conferences and SMSes instantly
• No Passwords Needed
  View all archives in your computer without knowing any passwords
• Quickly Find Information
  Searching for something that your friend gave you? It can be done in seconds!