
Microsoft is rolling out a feature update to prevent an issue where a meeting cannot be updated or canceled in Outlook because it has too many recipients.
Office 365 has a maximum of 500 recipients for any message. This affects calendar events because of the way that responses are currently recorded for meetings. For example, a meeting can be sent to a large distribution list (which only counts as 1 recipient). If responses are requested, each time an attendee responds to the meeting (accepting, tentatively accepting, or declining the meeting), the attendee is also individually added to the meeting recipients list.
If enough attendees respond, the number of recipients can surpass 500, and the meeting organizer is no longer able to update or cancel the meeting.

Advertisement
Microsoft is rolling out the first phase of improvements related to this issue. In this first phase, the goal is to ensure the organizer can always update/cancel the meeting. Therefore, once there are 400 recipients, no additional responses will be recorded. However, if the meeting is forwarded, those new attendees will still be added to the recipient’s table.
In a future update, they will ensure that responses will still be recorded, even after 400 responses. More details will be provided by Microsoft when those changes are released.
Microsoft will be gradually rolling this update starting this week, and they anticipate rollout completion by early May 2018.
READ: FIXING THE “OUTLOOK FILE ACCESS IS DENIED” ERROR
END
Disclosure: Some of the links on are “affiliate links”, a link with a special tracking code. This means if you click on an affiliate link and purchase the item, we will receive an affiliate commission. The price of the item is the same whether it is an affiliate link or not. Regardless, we only recommend products or services we believe will add value to our readers. By using the affiliate links, you are helping support the VOUdeals website, and we genuinely appreciate your support. Tags: Microsoft, Microsoft Outlook, Office 365