Our company president contacted me this morning and indicated that he was losing reminders. I went to check on it and found out that the entry still remains, but the little bell denoting a reminder is gone. The reminders that do show are over a couple years old. I read another question that had something similiar, but their calendar entries would vanish too. The president is using a Blackberry 7520 and we are running McAfee On Demand VirusScan software. His laptop is running Office 2k3.
This is the second time this problem has occured. He uses his calendar as a way of keeping track of tasks instead of using the Tasks portion of Outlook. We set them up in accordance to the Office online help page.