Try this
Cause:
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There can be numerous reasons why this meeting request was unavailable, one of the possible reason was to delete the meeting request without cancelling the meeting
Resolution:
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Ran the powershell to delete the calendar item with specific keywords in the subject and from a specific sender from any Calendar in the Organization. Below is the script:
Get-Mailbox | Export-Mailbox -SenderKeywords -SubjectKeywords "enter keywords here" -IncludeFolders "\Calendar" -DeleteContent
The above command will search every mailbox in the Organization and delete the meeting request meeting both the conditions mentioned
If you want to delete the meeting request from a particular users' calendar, you can use:
Get-Mailbox | Export-Mailbox -Identity -SenderKeywords -SubjectKeywords "enter keywords here" -IncludeFolders "\Calendar" -DeleteContent
If you want to test if the rules are matching the required criteria before deleting, you can export the item to another test mailbox, using:
Get-Mailbox | Export-Mailbox -Identity -TargetMailbox -SenderKeywords -SubjectKeywords "enter keywords here" -IncludeFolders "\Calendar"
Steve
Steve