Unable to share calendars - This sharing message is not valid - Outlook 2013 Exchange 2007

Running Exchange 2007 latest and greatest service pack and rollup with Outlook 2013 fully patched. When users attempt to share their calendar, the recipient receives an email that says "This sharing message is not valid. All action buttons have been
disabled" and "(Sender not verified) - Calendar".
We're not using IMAP or POP. Was working in the past and stopped working.

Hi,
Is Exchange account the default account in Outlook?
Does this issue occur on all users? (If no, please try to recreate problematic user’s profile to check this issue)
Please check the following setting:
Open AD users and computers.
Right-click on problematic user to properties.
Under General tab, check if the E-mail field is right.
Best Regards.
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Lynn-Li
TechNet Community Support

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