Q: What features in OWA Premium are not available with OWA Light?

Answer

• The Tasks module
• Task specific properties: Only the text of the task items can be read through OWA Light.
• Search for mail items: OWA Light users can search only Contacts and Address Book.
• Reminders
• HTML composing of messages: OWA Light users get only plain text textboxes with no editing or formatting options.
• Flags and Categories
• Weekly view in Calendar: OWA Light shows the daily view only.
• Free/Busy grid in Appointment/Meeting Scheduling Assistant: OWA Light users get only "Suggested Times".
• Print
• Spell Check
• Conversation View
• Account Quota information
• Recover Deleted Items
• Calendar month view
• Add/edit distribution lists
• S/MIME features
• Add/edit rules

Note: The full featured (premium) version of OWA is only available when accessed using Internet Explorer 6.0 or higher on a Windows platform. OWA Light offers more limited functionality on other supported web browsers and platforms.

For more information, see: Microsoft's Differences Between OWA Light and Premium