meeting series invites and cancellations made on behalf of another user sends update for each instance

environment: AD Domain, Exchange 2003, Outlook 2007 on Windows XP sp3. We have 2 users who manage calendars for VP's. Just recently they both had the same issue happen:  One cancelled a weekly recurring meeting on behalf of the VP, then got hundreds of cancellation notices, 1 for each date the meeting occurred- all the way back to 2005.
The other user added a new recurring meeting to a different VP's calendar and then watched as dozens of meeting invitations came pouring into her inbox, 1 for each instance of the meeting. We cannot figure out why this is happening only to them and why it suddenly began happening now.  Both have managed outlook calendars on behalf of others for well over a year without incident.
misengineersAsked:
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Stacy SpearPresident/Principal ConsultantCommented:
Did the first user cancel the series? Even so, seems strange that that happened.
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misengineersAuthor Commented:

we have discovered elsewhere that the source of the problem is most likely iphone 3.0 software and exchange calendar sync bug. both VP's have iphones and this began shortly after the 3.0 software release.

http://iphone-chat.org/syncing-calendar-appointments-over-air-w-exchange-and-outlook-iphone-3g-58657/ 
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