Scenario: After a Outlook client upgrade to 2016, you notice that you cannot view/alter the calendar of someone you have delegated permissions for in the Outlook client. OWA works fine and you can still view/alter the calendar through a Outlook 2013 client.
Resolution: We found that the WindowsEmailAddress is:
- Different than the PrimarySMTPAddress
- not a email alias for the mailbox (The WindowsEmailAddress shows a alias that is not in the proxy addresses/Emailaddresses).
Change the WindowsEmailAddress to an address that matches the PrimarySMTPAddress (which is a alias/proxyaddress for the mailbox)
Set-Mailbox jdoe1 -windowsemailaddress <whatever the primarysmtpaddress is>