Do not hide emails that contain a .ics file attachment in webmail
The specific issue I'm having is someone sends a calendar invite to a user (ie, email that has a .ics file attached) then the email itself does not show in webmail and the only place the user can "see" the message is in their calendar inbox. This has two big problems:
1) The user DOES get to see the actual email on their Android phone or another mail program (syncing via standard IMAP) so is confused why the email is missing from their webmail inbox.
2) The content of the actual email is missing from the webmail system. The only content that is available is whatever was in the .ics file itself and then only via the calendar inbox, not the regular mail inbox.