If you’re sending meeting requests or invitations there’s an important Outlook option to check.
Normally, Outlook within a company, uses Microsoft’s own method for including meeting details. That’s OK ‘in-house’ where you can be sure everyone has Outlook. But you don’t know what people outside the organization use to manage email and calendar.
Buried at Options | Calendar is ‘When sending meeting requests outside of your organization, use the iCalendar format’.
iCalendar is an open and widely used format for sharing appointment, meeting or event information.
Office-Watch.com has talked about iCalendar many times before. It’s the way web sites, airlines and others let you import a flight or event into your calendar.
To ensure full compatibility make sure the ‘When sending meeting requests outside of your organization, use the iCalendar format’ is on.