How to Delete Email Addresses From Outlook (Auto-Complete, Contacts, and More)

Outlook stores email addresses in more than one place — and that distinction matters a lot when you're trying to delete one. Whether you're cleaning up an outdated contact, removing a mistyped address that keeps appearing as a suggestion, or wiping an entire account from your device, each of those tasks lives in a different part of Outlook's system.

Why Outlook "Remembers" Email Addresses

Before deleting anything, it helps to understand where Outlook actually stores addresses. There are two main sources:

• Auto-Complete cache (also called the nickname cache): This is the list of suggestions that appears when you start typing in the To, CC, or BCC field. Outlook builds this list automatically from addresses you've typed or emailed before. It's not your contact list — it's a separate, local cache.
• Contacts (People): These are addresses you've deliberately saved, either manually or synced from an account like Google or Exchange. They appear in your address book and can be searched from the contact directory.

Deleting from one won't affect the other. That's why you can remove someone from your Contacts and still see them pop up as an auto-complete suggestion — or vice versa.

How to Delete an Address From Auto-Complete Suggestions 🗑️

This is the most common reason people want to delete an email address. You mistyped someone's address once, saved a defunct address by accident, or just want to clean up the suggestion list.

In Outlook for Windows (desktop app):

1. Start composing a new email.
2. Begin typing the address in the To field until the unwanted suggestion appears.
3. Use the arrow keys to highlight it, or hover over it with your mouse.
4. Press the Delete key, or click the X that appears to the right of the suggestion.

That's it. The address is removed from the auto-complete cache immediately.

To clear the entire auto-complete list at once:

1. Go to File → Options → Mail.
2. Scroll to the Send messages section.
3. Click Empty Auto-Complete List.

This wipes the entire suggestion cache — useful if the list has become cluttered or you're handing a device to someone else.

In Outlook on the Web (OWA):

Outlook on the web maintains its own separate suggestion cache. To remove a suggestion:

1. Start a new email and type in the To field.
2. When the unwanted address appears, hover over it.
3. Click the X or press Delete to remove it from suggestions.

There's no bulk-clear option in the web version through a simple settings menu — you remove entries one at a time.

In Outlook for Mac:

The Mac version handles auto-complete slightly differently. Suggestions are drawn from a combination of recent recipients and your contacts. To remove one:

1. Start typing in the To field.
2. Hover over the suggestion and click the X that appears.

How to Delete a Saved Contact From Outlook

If the address is saved in your Contacts (People) app within Outlook, deleting it from auto-complete won't remove it from your address book.

In Outlook for Windows:

1. Click the People icon (the contact/address book section).
2. Find the contact you want to remove.
3. Right-click and select Delete, or select the contact and press the Delete key.

In Outlook on the Web:

1. Click the People icon in the left navigation panel.
2. Search for or browse to the contact.
3. Open the contact, then select Delete from the options menu.

Keep in mind: if your contacts are synced with an Exchange server, Microsoft 365 account, or connected service like Google Contacts, deleting on one device or platform may remove the contact across all synced devices.

Account-Level vs. Local Storage: A Key Variable

This distinction becomes especially important in workplace environments. If your Outlook is connected to a corporate Exchange or Microsoft 365 account, your contact changes may sync to your organization's global address list — or they may not, depending on your IT setup and permissions. Personal contacts you've added yourself are typically separate from the company-wide directory.

When "Deleting" Doesn't Seem to Work

A few situations cause confusion:

• The address reappears after deletion: This usually means it exists in both the auto-complete cache and your saved contacts. Deleting one source doesn't clear the other.
• You can't edit or delete a contact: In Exchange environments, some entries in the Global Address List (GAL) are managed by IT administrators and can't be edited by individual users.
• Deleted contacts return after sync: If you've deleted a contact locally but it's synced from an external service (like Google Contacts), it may reappear after the next sync. You'd need to delete it from the source account.
• Outlook mobile behaves differently: 📱 The iOS and Android versions of Outlook have their own suggestion behavior and contact management flows, which don't always mirror the desktop experience.

The Version and Setup Question

How Outlook stores and surfaces email addresses depends heavily on which version you're using — classic Outlook for Windows, the newer "New Outlook" experience, Outlook for Mac, Outlook on the Web, or the mobile apps. Each has slightly different menus, cache behaviors, and sync logic.

Your account type matters just as much: a personal Microsoft account, a Microsoft 365 subscription, a standalone Exchange account, and a third-party IMAP setup all handle contact storage and syncing in ways that can produce different outcomes when you try to delete something.

What works cleanly in one setup may require a few extra steps — or a different approach entirely — in another.