Combining Outlook Calendars
1) Access the calendar you would like to import into your existing calendar. Under the File tab, select Options > Advanced, then Export.
2) Select the file you want to export and click Next.
3) Choose to export the calendar as an Outlook Data File (.pst), then click Next.
4) Choose the calendar folder you want to export, and uncheck all the sub-folders. Click Next.
5) Choose a location to store the file on your device, then click Finish.
6) Open Outlook Calendar, then go to File > Open & Export. Select 'Open Outlook Data File'. Select 'Do not duplicate items' under Options.
7) Select 'Select folder to import from' and click the Calendar folder. Click Finish.