By default the Calendar app on your iPhone or iPad will show calendars from the accounts you have added in the Accounts & Passwords section of the Settings app. However what if you want to add a shared calendar to your iOS device? The easiest way to do this is to install the Outlook app, which allows you to add shared calendars in a similar way to the desktop Outlook … [Read more...] about How to access Office 365 shared calendars in the default iOS Calendar app