According to this it around 1024 characters
https://office365itpros.com/2021/04/20/customize-responses-calendar-meeting-requests-conference-rooms/
This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
Good Afternoon,
We are in the process of spinning up new resource mailboxes for conference rooms.
The rooms are using the default of AutoAccept for Calendar Processing.
There was a request from management that we put a message to the meeting organizer when the request is sent.
That is not a problem as we have done this and tested without issue. My question, is there a character limit for this automated response?
That will help us draft and plan out the responses accordingly.
Thank You
Brian Dougherty
According to this it around 1024 characters
https://office365itpros.com/2021/04/20/customize-responses-calendar-meeting-requests-conference-rooms/