Attendee's presence isn't updated in the Outlook Scheduling Assistant
Original KB number: 2964694
Symptoms
An attendee's presence isn't automatically updated in the Outlook Scheduling Assistant in Microsoft Outlook 2013.
For example, after you create a new meeting or appointment, you open the item and view it from inside the Scheduling Assistant. If one of the meeting or appointment attendees changes their presence from Available to Busy, that change will not be reflected in the UI.
Cause
This is a known problem in Outlook 2013.
Workaround
To work around this problem, hover your mouse pointer over the presence pawn or jelly bean. This will cause the presence data to update.
More information
This problem occurs when you use any instant messaging client, regardless of version.