Unable to delete Calendar events on Shared Calendar

We recently migrated from Exchange 2010 to Exchange 2013. The users have Outlook 2010 installed. When a user tries to delete a calendar event that they created, they are able to delete it. However, when closing and re-opening Outlook or even just going to view email and then back to the Calendar event, it re-appears. The user permissions shows that the users have the ability to create and delete their own events.
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Scott CSenior EngineerCommented:
Try deleting with OWA or an Outlook client that you've verified isn't using cached mode.  It almost sounds like a local copy is being deleted then synching back up from the server.

If you delete with OWA or an online client, you will be removing directly from the server itself.
emconsultingAuthor Commented:
When logging in with the users credentials in OWA, I am not given the option to delete a specific calendar event that she created; she is only given the option to Open or Forwared.

 However, when I log into OWA with the domain admin account and go to this same event, I am then given the option to Delete. I have tried adding the user to have Full Access Permission to this Resource Calendar via the Mailbox Delegation tab, but I still did not see the option to Delete the event while logged into OWA with her account.
emconsultingAuthor Commented:
After completing the decommission of the old mail server on the network, it seems to have resolved the issue.

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emconsultingAuthor Commented:
No other ideas
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