Managing participants

• Adding and removine sharees
• Delegating ownership of share
• Suspending the share for other people
• Resending failed invitations
• Setting permissions and changing permissions

Sharing status feedback

• Sidebar icon reflecting sharing status: Online, failed
• Incoming v. Outgoing shares
• Sharee status: viewed v. not viewed
• Sharee status: failed invitation

Managing the share

• Terminating the share (removing it from server)
• Suspending the share
• Renaming the share
• Adding or removing shared items from the All collection
• Marking items as private
• Delete the share and then recall it from the invitation
• Matching up invitations with the shared version of the event
• Matching up emails with the shared version of the email

Specific issues by domain

• Communications shares requires an additional Owner column in addition to the Who column because the user might not be in either the To or the From field of a message
• Events Who's status us reflected? The sharer's or the sharee's? That depends on context. For Mitch and Esther, Esther will want to see Mitch's status. For an office calendar, users will want to see their own statuses. One hack might be to remove status from shared calendars. A more complex solution would be to reflect status per user and give users the option to choose who's status they want to see for that shared calendar.
• Tasks and Events Private annotations.