Clear Email Address Cache in Outlook: Step-by-Step

To clear Outlook’s remembered email addresses, remove individual suggestions with the X beside them, or, in classic Outlook for Windows, open File > Options > Mail > Empty Auto-Complete List to clear them all at once. This removes suggested recipients, not saved contacts or messages. The exact options depend on whether you use classic Outlook, new Outlook, Outlook on the web, or Outlook for Mac.

What You’ll Need

Access to the Outlook app or website where the unwanted address appears. Suggestions may be stored or managed differently across Outlook versions.
If you use a work or school account, your organization may manage some recipient suggestions. You can still try the steps below, but an administrator may need to help if a suggestion returns.
A few minutes to check the result by composing a new message. You do not need to delete contacts or change your account password.

Step-by-Step

Identify which Outlook you are using. Classic Outlook for Windows has a desktop ribbon and a File tab. New Outlook for Windows has a newer interface and a Settings gear, without the classic File > Options path. Outlook on the web runs in a browser, while Outlook for Mac has its own menus. If you are not sure, check the app name or whether a File tab appears. Use the matching instructions below; a command from classic Outlook may not exist in the newer app.
Try removing one unwanted suggestion first. Start a new email and click the To field. Type enough of the address or person’s name for Outlook to show its suggestion. Find the incorrect or unwanted entry and select the X at the right edge of that suggestion, if shown. In some interfaces, you can highlight the suggestion with the arrow keys and press Delete. Check that you have selected the suggestion itself, not text in the To field. This removes that cached suggestion without deleting the contact or changing sent messages.
Clear the entire list in classic Outlook for Windows, if needed. If you want to remove all saved autocomplete suggestions rather than just one, close any open message windows and go to File > Options > Mail. Under Send messages, select Empty Auto-Complete List, then confirm the prompt. The command clears Outlook’s list of suggested recipients. It does not remove contacts from your address book. Afterward, Outlook will build suggestions again as you send messages.
Use the setting only if you want to stop future suggestions. In the same File > Options > Mail area in classic Outlook for Windows, you can clear Use Auto-Complete List to suggest names when typing in the To, Cc, and Bcc lines. This turns off suggestions instead of merely emptying the existing list. Leave it selected if you want Outlook to start suggesting recipients again as you use it.
In new Outlook for Windows or Outlook on the web, remove suggestions individually. Compose a message and type the beginning of the unwanted address in the To field. If the suggestion has an X, select it to dismiss that entry. Repeat for other entries you want removed. These versions may not show the classic Outlook command for emptying the whole Auto-Complete List, so do not expect the File > Options steps to match. If the suggestion is a saved contact, edit or delete that contact separately only if that is what you intend.
In Outlook for Mac, remove the recipient from the suggestion list. Open a new message and start typing the address in the recipient field. When the suggestion appears, use its X control if available. Outlook for Mac menus and controls vary by version, so there may not be a Windows-style Empty Auto-Complete List command. Some versions also show a Previous Recipients list, commonly under Window; if it is available, select the unwanted entry and use the remove option. Check the confirmation carefully before removing multiple entries.
Check saved contacts separately if the address keeps appearing. Search your People or Contacts list for the name or address. If it is an outdated contact, edit its email field or remove the contact only after confirming you no longer need it. The autocomplete cache and your contacts are different things: clearing one does not automatically clear the other. A recipient can appear again because the contact is still saved or because it is suggested from your organization’s directory.
Test the change in a fresh message. Close the message you used to make the change, start another, and type the same few characters. Confirm the unwanted address is no longer suggested. If you cleared the whole list in classic Outlook, send messages to the recipients you use regularly over time; new suggestions may gradually appear. Do not send a test message to an address you do not recognize just to check the cache.

Common Mistakes

Deleting the wrong thing: Removing a suggestion is not the same as deleting a contact. The X beside a suggestion removes that remembered recipient from the suggestion list; deleting someone in People or Contacts removes a saved contact and can affect how you find that person later. If your goal is only to stop an old address from appearing while typing, start with the suggestion’s X.

Expecting one menu path to work everywhere: The File > Options > Mail route applies to classic Outlook for Windows. It is not a universal Outlook setting. New Outlook, Outlook on the web, and Mac may offer a per-suggestion removal control but not the same bulk-clear button. Confirm which app you have before following a menu path.

Confusing autocomplete with the address book: Outlook can suggest recipients from previous email activity, saved contacts, or an organization’s directory. Clearing the autocomplete list may not remove directory results or saved contacts. If an address still appears, inspect where the result comes from before deleting anything.

Clearing the whole list unnecessarily: The bulk-clear command in classic Outlook removes every suggestion, not just the one incorrect entry. You may need to re-enter regular recipients until Outlook learns them again. Use individual removal when only one or two entries are wrong.

Assuming the cache will stay empty: Outlook may create new suggestions as you address and send messages. Emptying the current list is a reset, not a permanent ban on all recipient suggestions. Turn off the Auto-Complete setting in classic Outlook if you want to stop that feature there.

Tips

Before removing an unfamiliar entry, compare its spelling and domain with a trusted contact record. An old address can be legitimate, but a similar-looking address may belong to someone else. If you are unsure, check through a separate, reliable channel rather than replying to the suggested address.

Use the smallest change that solves the problem. Remove one suggestion when only one recipient is stale; clear the entire cache only when suggestions are broadly inaccurate or you want a fresh start. If you turn off autocomplete in classic Outlook, remember that this affects suggestions in the To, Cc, and Bcc fields, not the ability to enter an address manually.

If you work across several devices, repeat the check in each Outlook app you use. A suggestion that disappears in one interface may still be visible in another because the apps, account types, or recipient sources differ. For a work or school mailbox, an address supplied by a company directory may be controlled by your organization rather than by your personal autocomplete list.

Finally, be cautious with advice that recommends deleting Outlook data files or resetting an entire profile just to remove a cached address. Those are broader changes than needed for ordinary autocomplete cleanup and can affect other settings or offline data. Begin with the built-in suggestion removal controls.

Troubleshooting

The X is missing: Make sure you are looking at a recipient suggestion, not a contact search result or a typed address already in the To field. Try typing a few more characters, then move the pointer over the suggestion. If there is still no removal control, check whether your version supports keyboard selection and Delete. Otherwise, use the matching app’s help or settings; do not use the classic Windows bulk-clear instructions in a different app.

The unwanted address returns: Check whether it is saved in Contacts or People, or supplied by your work or school directory. If the old address is in a contact, update that record. If it comes from the directory, contact your organization’s administrator. Also consider whether you removed the suggestion in a different Outlook app or account from the one where you are now composing.

The classic Outlook button is unavailable: Confirm that you opened classic Outlook for Windows and selected File > Options > Mail. New Outlook has a different settings interface. If your organization manages the installation or account, a policy may limit available settings; ask your IT support team before changing profiles or deleting data.

A cleared list starts suggesting addresses again: This is expected after you send messages or use recipients. The list repopulates with new activity. In classic Outlook for Windows, clear the checkbox for Use Auto-Complete List to suggest names when typing in the To, Cc, and Bcc lines if you want to disable that behavior. In other versions, use the available per-suggestion controls and settings for that app.

You removed a contact by mistake: Look for it in the Deleted Items folder or the deleted-contacts recovery options available for your account. The exact recovery route depends on whether the contact was stored in an Outlook.com, Microsoft 365, Exchange, or local address book. Avoid emptying Deleted Items until you have checked whether the contact can be restored.

Frequently Asked Questions

Does clearing the Outlook email address cache delete my contacts?
No. Clearing the Auto-Complete List in classic Outlook removes recipient suggestions, not saved contacts. Removing a contact is a separate action in People or Contacts.

Can I remove just one address instead of clearing everything?
Usually, yes. Type the address or name in a new message and select the X beside the unwanted suggestion. This is the best option when only one cached entry is incorrect.

Will Outlook remember the address again?
It may. Outlook can create new suggestions from later email activity. In classic Outlook for Windows, turn off the Auto-Complete suggestion setting if you do not want it to suggest recipients.

Why does an address still appear after I clear the cache?
It may be a saved contact, an organization directory result, or a suggestion in another app or account. Check the source of the result and remove or update it there if appropriate.

Is the process the same in Outlook on the web and the desktop app?
No. Classic Outlook for Windows has a bulk-clear command under File > Options > Mail. New Outlook, the web app, and Outlook for Mac have different interfaces and may rely on removing suggestions individually.

Can I undo clearing the whole Auto-Complete List?
There is not a simple restore button for the cleared suggestions. Outlook can build the list again through future use. If you need an address immediately, enter it manually or select it from your contacts.

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