If outdated or incorrect addresses appear when composing emails in Outlook, you can remove individual autocomplete entries.
Steps:
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In Outlook (desktop): Start a new email, type the address, and click the X next to the incorrect suggestion.
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In Outlook on the web (OWA): Start a new email, use the arrow keys to highlight the incorrect address, and press Delete on your keyboard.
Notes:
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If issues persist, search your Contacts and Suggested Contacts folders to remove outdated entries.
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You can also clear the entire autocomplete list by going to File > Options > Mail > Empty Auto-Complete List.
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If problems continue, you may need to create a new Outlook profile. Contact your IT support for assistance.
Related Resources:
For full instructions, refer to this Microsoft article: Remove autocomplete list entries one at a time.