<div>
Have you removed that user from the calendar permissions ? And tried after making yourself the Owner of that calendar ?
</div>


Have you removed that user from the calendar permissions ? And tried after making yourself the Owner of that calendar ?

<div>
I am owner and there are no deleted users in the permissions list:-(
</div>


I am owner and there are no deleted users in the permissions list:-(

<div>
It does appear that I only have a problem with one orphans appointments: &nbsp;other orphan's appointments do seem to be deletable. &nbsp;So maybe the problem here isn't the appointments orphan status.
</div>


It does appear that I only have a problem with one orphans appointments:  other orphan's appointments do seem to be deletable.  So maybe the problem here isn't the appointments orphan status.

<div>
Have you checked if the user still exists in the ADSI ?
</div>


Have you checked if the user still exists in the ADSI ?

<div>
<div class="content wysiwyg-content">
I have some recurrent appointments in an &nbsp;Exchange 2013 public folder: &nbsp;the user who created them has been removed from the system. &nbsp;Any attempt to delete the appointments results in an &quot;Unknown error&quot;.<br />
<br />
Any suggestions how I might delete these orphans?
</div>
</div>


I have some recurrent appointments in an  Exchange 2013 public folder:  the user who created them has been removed from the system.  Any attempt to delete the appointments results in an "Unknown error".

Any suggestions how I might delete these orphans?

Exchange 2013 orphaned recurrent appointments in a public folder

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.