Why can't I accept iCal invites on one Mac but can on another?

I have three Macs: 1. an iMac which sits on my desk. 2. An older MacBook Pro and 3. a brand new MacBook air which I bought a week or two ago to replace the older MacBook Pro.
All three are running Lion, the first two upgraded from Snow Leopard, the MacBook Air was purchased with Lion.  All three are fully updated using software update.  All three are synchronised using mobile me.
I am not using any server capability.
Here's my issue:
When one of my customers sends me an invitation to a meeting I get the invite in an email of course.  These invites come exclusively from Outlook as that's what all my clients use but that should not be relevant.
When I double click on the invite the appointment goes to iCal; mobile me then syncs this across all three Macs.  Irrelevant of which Mac I double click from the mail invite the following happens:
On the iMac and Macbook Air the meeting is inserted in my calender.  The meeting is coloured blue (my default calendar colour) and no matter whether I click on accept or decline nothing happens and no response is sent through mail to the meeting organiser.
On the MacBook Pro the meeting is inserted in the calendar in grey with a dotted line border around it.  When I open the meeting and accept or decline the meeting on the MacBook a mail response is sent to the organiser - this is the correct version of what should happen.
Every single setting that I can find in both Mail and iCal is the same on all three Macs as far as I can see.  Has anyone got any ideas why the MacBook Pro would work and not the other two machines - it's a little annoying to have to fire up the old MacBook every time I want to accept a meeting request!
Many thanks for any help.
David.

I think I've solved this.
In address book only the Macbook Pro had my own card set as 'My Card'.  Although Mobile Me was syncing the address book it obviously doesn't carry the My Card attribute across so this wasn't set on the other two Macs.
Weeks I've been looking at this and then I find the answer a few hours after posting the question

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