Mac calendar (Mountain Lion) cannot accept an invitation with Exchange Server 2010

Hi all,
My boss are using Mac calendar (Mountain Lion) sync with his Exchange Server account, User sent him an invitation. When he tried to accept all invitations, an error message appear:
Your calendar couldn't be refreshed. There was an unexpercted error with the request (domain EWSExchangeWebServicesErrorDoma / error 285)
Could anyone help me to solve?
Thanks

Started experiencing this same issue with new Macs on Moutain Lion connecting to MicroSoft Exchange Server.
ERROR Says:
Calendar can't save the event "event name here" to the Exchange server.
The account "describes calendar name" currently can't be modified. to discard your changes and continue using the version of your calendars that's on the server. click Revert to Server.
Then gives the buttons "Revert to Server" "Try Again" or "Ignore"
!!! Somehow it seems like this is a known issue, otherwise WHY would Apple have given us those 3 buttons to click on?
Needless to say this is causing productivity problems as it disrupts the very busy schedule of many users. Apple needs to provide some workaround for this.

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