ical and outlook - meeting invites

[mosaicgirl821]

I use a MacBook Pro with OSX 10.5.7.

My husband uses a PC and Outlook at work.

I send him a meeting invite. He receives it just fine. He accepts the invite. I receive and email notifying me that he has accepted.

I downloaded a program called Letter Opener so that my .mac email can read his acceptance (in the accept email I receive, it comes over as a winmail.dat file that I can not view otherwise).

When I open up the resulting .ics file by double-clicking it, iCal becomes active. However, it does not show my husband as having accepted the meeting.

If I drag the .ics file to iCal manually, it appears as an attachment (in the Edit dialogue box in iCal, under "attachments") to the event rather than showing my husband as having accepted it.

What am I doing wrong here? Or perhaps a better question would be, why does the little question mark keep showing up next to his name under "attendees"? Do these two programs talk to each other seamlessly?

If not, is there a proper workaround?