Hello Donna, do you see anything logged in the Calendars log under Manage>Troubleshooting>View Logs? You can look for a conversion log under your install directory as well, this might point at a conversion failure for the calendar data XML files in which case we might need to reconvert them. Can we get you to submit a support ticket on this?
Kyle Kerst
System/Network Administrator
SmarterTools Inc.
(877) 357-6278
www.smartertools.com