1. In Outlook, open the Calendar, and select the calendar you want to export.
   
   
   
   
2. Click File > Save Calendar.
   
   
3. Use the default name or type a name for the iCalendar file in the File name box.
   
   
   
   
4. You’ll see a summary showing the calendar name, date range, and detail level next to More Options. If you’re satisfied with the summary, jump to step 7, otherwise continue with the next step.
5. Click More Options.
6. Click the Date Range arrow, and choose the amount of calendar data you want to include in the iCalendar file or click Specify dates to enter a custom date range.
   
   
   
   
7. Click the Detail arrow and, choose the amount of detail you want to show.
8. Click OK, and then click Save.
9. To ensure all folders are up to date, select the Send/Receive tab in the Toolbar and select "Send/Receive All Folders".
10. Once updated, a line reading "All folders are up to date" should appear in the bottom right of the Outlook window.

To manually change your data sync settings in Outlook, please review this article.