I had a problem with one of my users regarding her Blackberry device , she was receiving meeting invitations as an Email not as a Meeting requests.
the problem was with her Mailbox configuration , the Feature / option ” Process External Meeting Messages” was turned off (set to false) .
To solve this problem you need to get the user mailbox configuration using PowerShell command, and set the value of “ProcessExternalMeetingMessages” to do that use the following:
Get-CalendarProcessing -Identity <username> | format-list
if the value is set to “False” then you will need to set it for “true”
to do that you can use the Following Command-line :
Get-mailbox <alias> | Set-CalendarProcessing -ProcessExternalMeetingMessages: $true
check again the value of the “ProcessExternalMeetingMessages” it should be “true” .
and this was enough to solve my problem.