According to a document posted on SOM Information Technology Service Catalog any updates that do not affect the date, time, location, subject, or recurrence pattern are automatically sent to the deleted folder.
“The following link states that this was an intended change by microsoft around Q2 of 2019. Any updates to meetings that do not affect the Date / Time / Location / Subject / Recurrence Pattern are at risk of having email updates sent to recipients Deleted Items folder. Essentially if an attachment is placed on a meeting that could be sent to 50 employees the invite may still arrive in the Deleted items folder because if it is already accepted. This is causing SOM employees to miss out on important meeting details.
The following Microsoft answers states this can only be fixed via a Global change. However ITS has confirmed that they will not be making this global change.
Fix provided by Microsoft:
Note: Update that caused the change, see "Outlook calendar - automatic processing of small changes in meeting details"
Workaround via powershell:
- Connect to company O365 environment via PS session.
- Type get-organizationConfig
- The below will be set as shown if causing the issue:
- Type Set-OrganizationConfig -VisibleMeetingUpdateProperties "AllProperties"
- Type get-organizationConfig again to verify change has been made.