How to Send iCal Invites to Outlook

I received a meeting invitation from someone but I cannot accept the meeting invitation as I can't use the Accept, Decline and Tentative buttons. I believe the sender used iCal on a Mac to send me this meeting request. Is there any way I can still accept this so it will go into my Outlook Calendar?
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I have been working on iCalendar for quite some time now and after a long and hard effort I have an iCalendar format which is acceptable to more or less all versions of Outlook. The problem I'm fac...

Want to make sure registrants actually show up to your event? Here's how to send them a calendar invite via email.