An XP user would not be able to open a .ics file. Your best option
there is sending the task or event as plain text, and letting them
enter it themselves.
An XP user with a program, like Outlook, that sends and receives invitations
_should_ be able import and pen an .ics file, but Outlook may be using a
very non-standard version. There are enough points of correspondence that
Mac Entourage and Windows Outlook users on the same Exchange server can
actually send each other invitations. It doesn't work like that otherwise,
but certainly an invitation sent by Outlook appears in Entourage as an .ics
attachment. Once you set .ics files to open in Entourage instead of iCal
(drag one to the desktop, do a Get Info on it, set "Opens With" to
Entourage, then click Change All), the attachments will appear with
Entourage icons and double-clicking it should open it in Entourage as an
event in the calendar. So it would be nice if it worked the other way too,
but Outlook probably doesn't bend over backwards to accommodate Entourage in
return. Still - it would be worth trying, just to see if it works. In
Outlook, double-click the .ics attachment to see what happens. If that just
errors, drag it to the desktop and try there. It's possible that it might
even enter the calendar without opening up as a window, so check the date
and time that it is meant to occur, to see if it's there. What you won't get
is the option in the email to Accept, Decline, etc.
--
Paul Berkowitz
MVP MacOffice
Entourage FAQ Page: <
http://www.entourage.mvps.org/faq/index.html>
AppleScripts for Entourage: <
http://macscripter.net/scriptbuilders/>
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PLEASE always state which version of Microsoft Office you are using -
**2004**, X or 2001. It's often impossible to answer your questions
otherwise.