Appointments duplicating in Outlook

[Planning]

Hi all,
This morning two of our users in the office received upwards of 50 old outlook appointment reminders after they opened Outlook. This also created many many duplicate appointments in Outlook's calendar.
When we went through the Outlook calendar and deleted the dupliate appoinments, upon sync the appointments were all removed from both Outlook and Sugar.

We're running Windows XP, Outlook 2003, Outlook plug-in and Sugar OpenSource 4.5.1.

Any help would be greatly appreciated!

Thanks,
~Eth

[Planning]

/bump

Anyone know what may be causing this to happen?