Do you have IMAP/POP3 users? It amazes me to see the some stubborn users refused to use Microsoft Outlook on their Mac/Windows computers. They uses the limited featured IMAP client. Hey! Whatever makes you happy, I guess.
Are they looking for the option “Send event invitations in iCalendar format” in OWA settings? This options converts meeting requests into a iCalendar file attachment.
They are expecting to find the option under
OWA Settings >>> Mail >>> Accounts >>> POP and IMAP
OR
OWA Settings >>> Mail >>> Sync email
Instead they are seeing this in the new OWA UI.
I have learned that user cannot change this settings anymore. BUT as an Exchange Administrator, YOU can change this setting behalf of the user. Here is the PowerShell Command (connect to Exchange Online first):
# Provide the identity as email address of the user
Set-CASMailbox -Identity StoneAgeIMAPuser@acme.com -ImapForceICalForCalendarRetrievalOption:$true -ImapUseProtocolDefaults:$false
Ta..da! Now that stone age IMAP user will start receiving future meeting requests in iCalendar file attachment. Say Hi! to them behalf of me.
Anand, the Architect 