I got this error when I upgraded from Office 2002 to 2003. I followed the instructions from RIM to work out it was my calendar.
Sent the details through to my service provider (who my hubby works for!) and they just came back and told me that they are not MS certified so can't help. They suggested I call the company I bought my pc from for help!!!
I was mightly p**d off because my pc crashed a couple of weeks ago and what with the hassle of getting that back up and running, this was another inconvenience.
Thank goodness for the internet, google searching and this forum! I am now a member and will go here first for any more issues!