Open Outlook
Go to the Calendar view
Click Add Calendar
Select Create New Blank Calendar or From Address Book
Enter a name for the calendar
Choose where to save it
Click OK or Save
To add a shared calendar, click Add Calendar and choose From Address Book or Open Shared Calendar
Search for the person, room, or calendar you want
Select it and click Add
To add a calendar from the internet, click Add Calendar and choose From Internet
Paste the calendar URL
Click OK or Add
To import a calendar file, go to File
Select Open and Export
Click Import/Export
Choose Import an iCalendar or vCalendar file
Select the file and open it
To view the added calendar, check its box in the calendar list