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Summary: The Outlook AutoComplete feature helps the users with auto-suggestions when you type the mail address in the “To” field. Most of the time, the Outlooks server catches the used mail addresses quite easily but lately some users have reported the issue “Outlook AutoComplete Not Working”. To resolve this issue, follow our solutions guide along with a top utility that OST to PST Converter that helps you fix any OST related issues.

We frequently contact the same clients, employees and admins so, the “Outlook AutoComplete” becomes crucial. It automatically detects the email addresses in the “To” field that helps you with the ease of finding your addresses promptly. But what if the Outlook AutoComplete stops working?

Looks like not a big deal but the full-time users of Outlook might disagree. Looking at this situation of “Outlook AutoComplete not working”, we will help you out with the easiest and quickest solutions to get rid of this error instantly.

Causes for the “Outlook AutoComplete not working” issue

Before directly jumping on to the solutions, let us get to the basic causes of this error first. Here are a few mentioned below.

  • AutoComplete cache corruption.
  • AutoComplete feature is not enabled.
  • Outlook is not up-to date.
  • Incompatible add-ins.
  • Oversized OST file.
  • Corrupted or damaged ‘RoamCache’ folder.
  • Damaged user profiles in Outlook.
How to fix “Outlook AutoComplete not working” error

Outlook AutoComplete not working can be frustrating, but there are several solutions you can try to resolve the issue. Here are six potential solutions:

1. Enable the AutoComplete feature

Outlook AutoComplete might not work if the AutoComplete setting isn’t enabled. For more information, follow the steps below.

  • Access Outlook and go to the File menu. Tap on Options and then click on the tab Mail.
  • Within the Send messages section, check that the Use Auto-Complete List to suggest names when typing in the To, Cc, and Bcc lines box is ticked.
  • Tap on Empty Auto-Complete List and click on Yes to confirm.
  • Hit OK to finish.
2. Recreate RoamCache

Recreate the RoamCache folder in Outlook to resolve the AutoComplete not working issue. For this, you need to rename or delete it from the default location. Follow below.

  • Access Outlook and go to the File menu.
  • Go to Account Settings> Account Settings. srcset=Go to Account Setting” width=”584″ height=”317″>
  • Select your email account and tap on Change.Select your email account
  • Click on More Settings and go to Advanced.
  • Checkmark the option “Use Cached Exchange Mode”. Tap on OK.Checkmark the option “Use Cached Exchange Mode”
  • Within the Run window, type up %LOCALAPPDATA%/Microsoft/Outlook and hit Enter.
  • Find and rename the RoamCache folder to “RoamCache_old”.Find and rename the RoamCache
  • Launch Outlook. After a few seconds, it will create a new RoamCache.
  • Open a new email compose window and see whether the Outlook autofill is working or not.
3. Update Outlook to the latest version

You can counter the Outlook AutoComplete not working issue if your Outlook is not updated to the latest version. Here are the steps below.

  • Access Outlook and go to the File menu. Tap on the option Office Account.
  • Select the option Update Now and install the Outlook updates.Update Now and install the Outlook updates
  • After the update process, restart your PC.
4. Creating a new profile

As we know, a damaged Outlook profile can be one of the causes of Outlook AutoComplete not working problem. So, we need to create a new profile. Here are the steps to follow.

  • Exit Outlook and open the Control Panel.
  • Go to User Accounts > Mail > Show Profiles > Add.Go to User Accounts
  • Give your new profile a name and hit OK.Give your new profile
  • To add your email account, follow the instructions. Click on Next.To add your email account
  • Tap on Finish.Tap on Finish
  • Set the new profile as default or select ‘Prompt for a profile to be used’ after creating it.Set the new profile
  • Tap on OK and exit the Mail dialog box.
5. Remove faulty add-ins

In Outlook, third-party add-ins can also affect AutoComplete. Check for such add-ins and remove them. The steps to do so are:

  • Launch Outlook in safe mode and go to the File Menu. Tap on Options > Add-Ins.Launch Outlook in safe mode
  • Tap on Go and deselect all the add-ins.Tap on Go and deselect all the add-ins
  • Click OK and restart Outlook to finish.
6. Rebuilding the Outlook OST file

A problem with AutoComplete may also be caused by OST file corruption. Rebuilding the OST file will resolve this issue. To do this, here are the steps:

  • Access the Control Panel and go to the User Account. Tap on Mail.
  • Tap on Data Files and select your email account.Tap on Data Files and select your email account
  • Tap on Open File Location and open the OST file the OST file location
  • Rename your OST file with the extension .bak. This will create a backup of your OST file.Rename your OST file
  • Start Outlook. It creates a new OST file and synchronizes all mail items.
  • As soon as the synchronization is complete, AutoComplete should begin working.

When an OST file in Outlook becomes inaccessible due to issues like Exchange server malfunctions or Outlook profile corruption, converting it to PST format can be a practical solution. Kernel for OST to PST is a tool designed for this purpose. It efficiently extracts mail items from inaccessible, inconsistent, or orphaned OST files and converts them into PST format.

After conversion, these PST files can be imported into a new Outlook profile or account, restoring all mail items. Also, the tool offers direct export options to existing Outlook profiles, live Exchange Server, or Microsoft 365 for easy data migration.

Last thoughts

After thorough analysis, these are the best solutions to follow to fix the Outlook AutoComplete not working issue. Carry out the given solutions as per your convenience. In case the Outlook fails to recreate the OST file, it will be wise to convert it into PST format. For this conversion, we recommend you use Kernel for OST to PST Converter tool with its advanced features and easy to use interface.

Kernel for OST to PST Converter
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