A user originally had Outlook 2007 and when she deleted recurring events or any other event it would not delete those events in SharePoint. I assumed it was due to the incompatibility issue with SharePoint 2010 so I had the user upgraded to Outlook 2010 - yet she is still facing the same issue. My theory is the SharePoint calendar needs to be refreshed (delete all items within sharepoint) and re-sync with Office 2010?
Any thoughts?