Fix Outlook AutoComplete Not Working issue Quickly

OST to PST Converter /September 25, 2025

Outlook recognized for advance user-friend feature ,make it prefer choice for both person and professional communication . AutoComplete feature automatically suggest address in “To” field base on user’s email history. When this feature fail, user not access one of Outlook valuable convenience ,necessary to restore its functionality . This blog explain common cause of Outlook AutoComplete/Autofill issue and provide practical solution to fix them

What do When Outlook AutoComplete is not working?

“AutoComplete Not working” issue in Outlook occur when application fail to suggest previously used email address when composing a message .Normally you start typing ‘To,’ ‘Cc,’ or ‘Bcc’ fields , Outlook display a drop- down list of recently use contact .When this feature not working ,user forced to manually search for or type complete email address, unnecessary effort and wasted time.

Why AutoComplete not working in Outlook ?

Various factors can cause the Outlook AutoComplete function to stop operating correctly.

  • AutoComplete option disabled
  • Cache memory limit competed
  • Corrupted AutoComplete cache
  • A corrupted user profile
  • Use outdates version of Outlook
  • Damage roamCache folder
  • Oversized or corrupted OST file
  • Excessive mailbox size
  • Missing or Corrupted Outlook files

How we resolve “Outlook AutoFill / AutoComplete Not Working” issue?

Below are many manual troubleshooting steps to resolve AutoComplete issue in Outlook .Follow every step to determine which solution work best for your specific situation.

Method 1:Enable AutoComplete Feature in Outlook

Sometimes ,Users accidentally disable Outlook’s AutoComplete feature or default settings .When this feature disable, Outlook not suggest email address as you type. To resolve this, Enable AutoComplete feature by following these steps.

  • Open Microsoft Outlook and go to file menu.
  • Select Options ,then click on Mail tab
  • Select Send Message by scrolling down
  • check checkbox “Use Auto-Complete List to suggest names when typing in the To, Cc, and Bcc lines” select
  • Click Empty Auto-Complete list then confirm by yes.
  • Click Ok to apply change
  • Finally compose and send new email to see if issue resolved

Method 2: Rebuild Outlook AutoComplete List

If enable AutoComplete do not resolve issue, Problem stem from AutoComplete list itself. An overload or corrupted list cause malfunctions .Deleting current list and recreating it using steps below help.

  • Open Outlook and click File tab
  • From menu ,Select Options.
  • In Mail category ,scroll down to send message section
  • Click Empty AutoComplete List to clear current suggestion
  • Confirm action then select Ok to save changes
  • start sending email again – Outlook AutoComplete feature

Method 3:Configure New Outlook Profile

A corrupt Outlook profile cause AutoComplete issue, Create a new profile for resolve the problem .Follow below steps:

  • Close Outlook and open Control panel
  • Go User Account select Mail then click Show Profile and select Add
  • Enter name new profile ,configure email account and click OK to Save
  • Complete account Setup by following on screen instruction ,then Next and Finish.
  • After setup , set new profile as default or select “Prompt for a profile to be used.”
  • Click Ok and close Mail dialog Box

Limitation of Manual Methods:

  • Not resolve issue if root cause data corruption or profile-related problems
  • Delete all save address , which inconvenient for user who reply on previous suggestions.
  • Time -consuming and result in loss local setting and preferences
  • Require stable internet connection and introduce new bugs
  • Provide temporary fix: issue may return if root cause not addressed.
  • Troubleshooting conflict add -ins time consuming and impact productivity if essential add-ins disabled.
  • Risk of data loss if unsinged change are present ;re-synchronization take extra time.

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