1. Open Outlook   2. Select the "File" Tab at the top left of the screen   3. Select "Open & Export" - "Open Outlook Data File"                   4. A file Explorer tab will open, Locate the PST in question, select it, and hit "OK"            5. You will then notice the "Outlook Data File" Tab listed under your inboxes, you will be able to open this as if it was its own separate inbox.         NOTE* You can change the name of these Outlook Data Files by right clicking on the inbox and selecting "Data File Properties"     

Go to outlook.office365.com Click on initials in upper right-hand corner  Click on open another mailbox Type shared calendar then open Once at the shared calendar inbox, click calendar at the bottom left-corner of the screen Find desired shared calendar on left-side of screen and right click on it. Select sharing and permissions  Enter the name of the user who needs access and change can view all details to can edit Click share The user will get a email informing them, they'll need to click accept and it will show up under my calendars in outlook.