Exchange 2010 Deleted Recurring Meeting Reappears

Every once in a while I come across a user who has set up a recurring meeting (which got corrupted) in their Outlook Calendar and when they go to delete either the series or the single occurrence, it comes back immediately.
This happens whether they are using Outlook in cached or online mode and it happens in OWA as well. I tried a bunch of different remedies listed on forums and blogs to no avail.

Here's what did finally work:

Fire up PowerShell and give yourself Full Access to affected mailbox (in my case it was a Resource Mailbox for a conference room) by running:

Add-MailboxPermission -Identity "mailbox name" -User "admin user" -AccessRight FullAccess -InheritanceType All -Automapping $false

**Note** Change "mailbox name" to the mailbox you want full access on, change "admin user" to your alias. I also set AutoMapping to false because I don't want a bunch of extra mailboxes listed in my "OCD Clean" Outlook :)

After you have Full Access on the mailbox, go into Outlook, right-click the offending meeting and either Delete the occurrence or the entire series.

Then you can remove Full Access from the mailbox.