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Problem

"As a delegate of a calendar, when duplicating an old calendar entry, I'm unable to delete or change previous attachments. The attachments are deleted, but once I send the new invite using the delegator's account, the attachments reappear."

Solution

This is a known Outlook web and desktop issue and has been reported to Microsoft. As a workaround:

1. Create a new meeting.
2. Copy and paste the relevant details from the old to the new meeting. Attach Then, attach the updated files to the new meeting.
3. Cancel the old meeting, and send the new meeting invite. 

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