Why calendar meeting requests become garbled and cannot be read?

When someone sends a meeting request in iCalendar format from a POP/IMAP account in Microsoft Outlook to a non-Outlook user, the Content-Type:text/calendar information is not recognized. As a result, the message is not processed correctly.

Please try to do the following so that meeting request can be sent to non-Outlook user properly.

1. Open Tools ->Options
2. In the Preferences tab, click Calendar Options
3. In the Calendar Options  dialog box, under Advanced Options
4. Un-check the box When sending meeting requests over the Internet,
   use iCalendar format.