User receives Outlook appointments as regular emails they can't accept/decline

I have a user that when she receives appointments/calendar meetings from 2 other users on the same domain (not exchange but Google Apps hosted email for their own domain), the appointments show up as e-mails, not appointment items that they can Accept/Decline or setup reminders for.
The recipient having the problem is on Windows with Outlook.
The 2 senders who she can't receive appointments from, 1 is on Mac with Outlook, the other is on Windows with Outlook.

If I have the 2 users send their appointments to me at my personal e-mail which is on Exchange, with Outlook 2010, I can receive their appointments just fine.
And if I forward the appointments, from my personal Outlook, to the lady who receives them as e-mails, she receives my forwards as appointments.

So I'm not sure what can be causing this!?
garryshapeAsked:
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Blue Street TechConnect With a Mentor Last KnightCommented:
So is the problem solved or are you saying that IF they check gmail then Outlook seems to work? In other words, if they don't check gmail does the issue still persist? Please advise.
Did you disable the COM-Addins? Please advise.
Thanks
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James HodgeManaging DirectorCommented:
Hello Garry,

You don't use MessageLabs, do you?

http://www.office-outlook.com/outlook-forum/index.php/mv/msg/57447/0/20/ 

James
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garryshapeAuthor Commented:
That does not appear to be installed.
Although Eset is installed, apparently.
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Blue Street TechLast KnightCommented:
Hi garryshape!

I run over 200 systems on ESET and haven't had issues with them either being resident nor as COM Add-ins but as a troubleshooting step try disabling it in the COM Add-in. Try disabling other auxiliary add-ins as well like Adobe, etc. Only disable one at a time and reboot Outlook and test. Repeat until auxiliary Add-ins are all disabled.

Here is how to disable COMs here: http://www.msoutlook.info/question/88

Does this occur if you bypass Outlook and access the email via web browser?
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garryshapeAuthor Commented:
When they check it in Gmail web app, the calendar shows up fine. Then opening Outlook, the Calendar will show up fine again.
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Blue Street TechLast KnightCommented:
Glad I could help! Thanks for the points.
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