"Item could not be found" error when attempting to send Outlook 2007 calendar event update

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I have been battling with this issue for over a month, and I have tried everything that I could get my hands on.
The issue is that when one of the users I am supporting attempts to make a change to a re-occurring calendar event on Outlook 2007, she gets an error saying " Item could not be found" upon attempting to send the update of the calendar entry to the meeting participants. The change does take affect on her calendar, however she's unable to send the update to the participants.
Here's what I have tried so far:
-sending the update via OWA //same error comes up
-the /cleanfreebusy switch //same issue
-the /cleanschedplus switch //get an error saying invalid switch (attempted copying my outlook.exe file to her computer, and switch still wouldn't work even though I've confirmed it's a valid switch as per Microsoft)
-recreating her OST profile //worked for just under a month, then issue came back
-repairing her OST file using scanost //did not help
-turning off cached mode //did not help
Any help would be greatly appreciated. Thank you in advance.



When the problem occurs, does it affect all Calendar items or just some of them?
What kind of changes is the user making? Is she adding recipients, changing the time or some other change?
If the same error occurs in OWA, then one possibility is that some Calendar Props/settings maybe bad.
If you go in Outlook to your Calendar Folder and then go to the the View > Current View Menu and select " All Appointments" do the problem appointments have both Start and End Dates?


I opened the " All Appointments" view and found the re-occurrence of one of the events in question. It has the same end date as the start date, however it was set to go on forever. I changed it to end after 100 occurrences, and the user is now able to edit one occurrence. Thank you kindly for your help.
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