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.
emconsultingAsked:
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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.
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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.
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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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