You can't accept new meeting time proposals in Outlook for Mac
Original KB number: 2935220
Symptoms
In Outlook 2016 for Mac or Outlook for Mac 2011, you can't accept a New Time Proposal from an attendee. The New Time Proposed email message displays one of the following messages:
-
<Attendee Name> has tentatively accepted, but proposed that you change the meeting time and then send an update.
Proposed new time: <Date, time> -
<Attendee Name> has declined, but proposed that you change the meeting time and then send an update.
Proposed new time: <Date, time>
Cause
The Propose New Time feature isn't available in Outlook for Mac 2011 and Outlook 2016 for Mac versions 15.8.2 and earlier. Users who have these versions of Outlook for Mac can't accept a proposed new meeting time without manually modifying the meeting request.
Resolution
The Propose New Time feature is available in Outlook 2016 for Mac version 15.9 and later versions when you're connected to Microsoft Exchange Server 2013 Service Pack 1 (SP1) or a later version.
To use this feature when a new time proposal is received, open the New Time Proposed message, and then select the Accept Proposal or View All Proposals button.
Note
If you're running Outlook 2016 for Mac version 15.9 or a later version and you're connected to a version of Exchange Server that's earlier than Exchange 2013 SP1, the Accept Proposal and View All Proposals buttons don't appear.
Workaround
This workaround applies if either of the following conditions is true:
- You're running Outlook for Mac 2011 or Outlook 2016 for Mac version 15.8.2 or an earlier version.
- You're running Outlook 2016 for Mac version 15.9 or a later version and you're connected to a version of Exchange Server that's earlier than Exchange 2013 SP1.
To work around this issue, open the meeting from your calendar to modify the time, and then send the update to the attendees.
More information
For more information about proposing a new time in Outlook for Mac, see You can't propose a new time for a meeting in Outlook for Mac.