Andy Collins wrote:

Ok, so how do I now delete one of these calendars, and force all new
entries to go to the main one? Starting Outlook with the
/resetfolders switch didn't seem to work

Outlook will place all new items in the folders contained in the delivery
location data store, which you can choose with the "Delivery new e-mail to
the following location" drop-down at the lower left on ToolsE-mail
AccountsNext. After choosing the one you want, stop and restart Outlook.
Then delete the folder set you don't want by right-clicking its root and
choosing Close.
--
Brian Tillman