Microsoft Outlook
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Calendar
Seeing Other People's Calendars
I could only figure out how to add it using the on-line version of Outlook though once added, the other calendars are also visible on the local version.
Go to https://outlook.office365.com/ → Left Menu Lower Bar → Calendar icon → Search box → Search for person or conference room → "Add calendar" in the drop-down search result box: 
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Mark PTO
Go to online calendar, click on the day, create an all-day event and mark "Away".