Are there known issues with delegation in Exchange 2010 with Outlook 2013 x64 clients?

Recently, we upgraded our mail clients to Outlook 2013 (x64). Afterwards, we realized that previous calendar delegations stopped working. Now, delegated access to calendars no longer work as expected; access is denied.

Has anyone experienced this before? Is there a known fix?
U-g-oAsked:
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Adam FarageEnterprise ArchCommented:
Where are the calendar delegate permissions located? On the server level (Get-MailboxFolderPermissions) or at the Outlook level.

If I recall correctly if you upgrade a clients Outlook version and the permissions are located locally (so you right click the calendar and set the delegates there) then this would be lost. I would recommend reviewing one of the clients too see if the permissions even exist on the local client. If they do exist, I would recommend going through the control panel and recreating the Outlook profile.

In the future though I would delegate permission through Set-MailboxFolderPermission. This actually syncs to the server and the Administrator (you) can manage this.

And to answer your question, I am using Outlook 2013 and have no issues at all managing someone elses mailbox in the event I add full access or calendar delegate permissions (for troubleshooting purposes).
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U-g-oAuthor Commented:
Hi Adam,

Already, the 'Set-MailboxFolderPermissions' cmdlet has been run, but the issue remains. However, I now realize that the delegated access works okay when delegates use OWA. However, with the Outlook 2013 (x64) client, they can view calendar entries, but cannot add/create new items.
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Adam FarageEnterprise ArchCommented:
I would recommend recreating the Outlook profile, along with making sure *all* patches have been installed on the client running Outlook 2013.
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U-g-oAuthor Commented:
Hi,

Sorry for my delayed response. All patches have been installed, and MS has also advised us to disable add-ins. However, this is still not fixed.
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