ICal 5.0 ignores meeting acceptances ?!

Problem Description
I send out meeting invitations to other colleagues within my organization (Exhange 2010 server) from iCal 5.0 (Lion 10.7.1).  When people are sending their reply, I can see the "accepted" in the e-mail subject, but double-clicking on the attached ics file only works for some people sometimes to show the "accepted" in my iCal event. In most cases, ical simply ignores the acceptances.
The problem is persistent and seems to be independent from where the mail is coming (MS Outlook, Mac OS X (e.g. iCal 4.), or any other e-mail/calendar client). I could not find any pattern yet.
Workaround, that works in some cases, but not always...
Now I tried/did the following: I saved the ics files and open them with a text editor. The ics reply that did not work had an extra line that started with COMMENT. I removed that line from the ics file that did not work, saved the ics file and double clicked on it. Now that invitee shows as well as "accepted" in iCal 5.0. GREAT I thought...
BUT, I got a reply from another person, who uses Outlook on an Exchange 2007 server. His ics file also showed that COMMENT line. I did the same as above, but this time nothing changed in iCal ??? I even changed "2007" to "2010" in the ics file, but still no change in the invitee status. Why ???
Since I have meetings every day and want to use iCal to handle them, I need some quick fix.  If I could change the state of the invitee manually, that would be a work-around as well, but not a solution. Does anybody know how that would work?
Any hints that could help me are highly appreciated.  No one to blame... just looking for a solution.

Macobs30:
I have had this same problem and I search these boards often. You seem to be the only other person to have the same problem with getting iCal to accept and acknowledge sent acceptances. (How odd is that?)
Have you found something that works yet and/or did Zamian solve the problem?

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