noone wrote:

Thank you -- I'm not very computer literate, so I'm not sure how to
break up the Outlook file into parts like that.

I never said to break any file into parts. Let me be explicit.

Create a new calendar folder with FileNewFolder. Make sure you configure
it to contain calendar items. Make its root be the same root the current
calendar uses (i.e.,. not a subfodler of anything). Now, open your default
calendar and switch to a table view like By Category. Select all the items
in it with CTRL-A and then click and drag the selection to the new calendar
folder (or click EditMove to Folder) to move all of the items to the new
folder. Your default calendar will be empty now.

Try to sync. If it works, then open the new calendar folder, sidplay it in
a table view like By Category, click on the first item in the list, then
hold Shift and click on some item part way down the list (i.e., so you don't
select everything). Right-click and drag that selection to the default
folder, choosing Copy or click EditCopy to Folder. Try to sync again. If
that works, then continue on with another subset of the messages in the new
calendar folder. If it doesn't work, you know something that you copied is
causing the problem. You can empty the default calendar and go back to the
new folder, selecting a smaller group of messages to try. Eventually you'll
find the item(s) causing the problem and can either delete it or recreate it
manually. When you're all done and everything's back in the default
calendar, you can right-click the new one and choose Delete.
--
Brian Tillman