If you restored Office from a backup, or you deleted and reinstalled your Office apps and you had purchased a Microsoft 365 subscription through the Mac App Store, you might be able to restore the items you've previously paid for.
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Sign out of the Office app through which you made the In-App purchase. To find out which Office app you used to make the purchase, see below.
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Close and re-open the app.
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Click Restore previous purchase at the bottom of the Get started with Microsoft 365 window.
Find out which app you used to make the purchase
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Use the Mac App Store app to review your subscriptions.
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Sign in and look for a subscription starting with Microsoft 365 under Active Subscriptions. For detailed instructions, see How to change or cancel subscriptions on your Mac.
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The app icon determines which application you used to purchase the subscription.
