Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.
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Source: https://products.office.com/en-us/mobile/office
When you purchased your Office 365 subscription, have you read the requirements above?
If no, if your iPad cannot run iOS 10, you only way us to trade in your old iPad with a new one, but it depends on which iPad version you have.