Synching Event Categories Between Outlook and SharePoint

Oddly, within SharePoint 2010 at least, when you connect a calendar to Outlook it will not synchronise the category information for the event. It seems that Outlook uses a field named Categories to store this information and SharePoint uses Category.

Although not ideal, we can resolve the issue by visiting the List Settings page for the calendar, opening the Event content type and adding Categories from the list of pre-existing columns.