1. Navigate to portal.office.com
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4. Click the gear icon at the top right.
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7. Click the "Empty" dropdown in the row for the folder that you want to clear email from.
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8. Click the desired age of emails to purge for that folder.
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9. Emails will then be purged. This is not instant and can take some time depending on how many are deleted. You can close this window once the process is started.