Removing Email Addresses from Outlook's AutoComplete Cache

Outlook remembers up to 1000 email addresses you've used in the past, even if you have never stored them as Contacts. There are pros and cons to this behavior.

  • The main benefit is that you can easily retrieve email addresses you have used in the past, just by typing the first few letters of the email address.
  • A major drawback is that Outlook's AutoComplete entries are static and cannot be updated, which can easily lead to email bouncebacks if you are not careful. This means that, despite changing a contact's email address several times, Outlook will always suggest the first email address that was used.

Nevertheless, you can delete entries from the cache one at a time when necessary. Follow the steps below to accomplish this:

  1. Open Outlook.
  2. On the Home tab, click New Email.
  3. In the To: field, type the first three characters of the cached name to trigger the AutoComplete feature.
  4. Highlight the name or email address by hovering over it or using the Down Arrow key.
  5. Press Delete to remove the AutoComplete entry.