Features that are Different/Unavailable in Outlook
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Outlook allows for viewing multiple proxy calendars in an overlay view. There is no equivalent to GroupWise's Multi-User View, where each person's calendar appears in a column view.
Outlook will allow you to retract a message silently if it has not been opened by the recipient. However, if it has been opened, the recipient will receive a notice that you tried to retract the message.
When you send a message to someone in Outlook, you can ask for a return receipt to track if a message has been opened. In GroupWise, sent message tracking was very granular and allowed you to see when a message was opened, replied to, deleted, etc. This granularity is not available in Outlook.
Recurring appointments in Outlook must be based on a daily, weekly, monthly pattern. There is no option to randomly choose dates for recurring appointments as there was in GroupWise.
The concept of a reminder note does not exist in Outlook. Existing reminder notes in GroupWise will migrate as all day appointments in Outlook.