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What's new and improved for Office 2019?
Microsoft Office 2019 has a bunch of new features! Please see this support article in Microsoft's knowledge base to learn more.
Will documents created in older versions of Office open in Office 2019?
Yes, Office 2019 is backwards compatible with previous versions of Microsoft Office.
Not sure how to use certain features? Here are some quick starts guides.
Microsoft published some Office quick start guides for Mac and Windows:
Office for Mac Quick Starts
Office for Windows Quick Starts