That's normal if your only mail account is Exchange, which should handle the iCalendar conversion automatically. If you add a POP3 account to your mail profile, the check box will be available.

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Sue Mosher, Outlook MVP
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> In tools-->options-->calender options, "when sending meeting request over
> internet use icalendar format" options is greyed out, how to enable it?
Ravishankar.N - 18 Aug 2006 10:09 GMT
Hi sue,
thanks for the reply, it was quiet useful.
regards,
ravishankar
> That's normal if your only mail account is Exchange, which should handle the iCalendar conversion automatically. If you add a POP3 account to your mail profile, the check box will be available.
>
> > In tools-->options-->calender options, "when sending meeting request over
> > internet use icalendar format" options is greyed out, how to enable it?