Outlook auto complete won't display 1 specific email/contact address

Dear AdvancedNetworkSolutions,

Good day! Thank you for posting to Microsoft Community. We are happy to help you.

Based on your description, I understand that you have a query "Outlook auto complete won't display 1 specific email/contact address". Before we proceed the investigation, we need more detailed information about the situation you are experiencing.

Please help us in isolating the issue by providing the following information:

1. What version of Outlook are you using? See What version of Outlook do I have? (microsoft.com)

2. Have you tried deleting the cache? Close Outlook and delete > %userprofile%AppData\Local\Microsoft\Outlook\RoamCache\Stream_Autocomplete_[Bunch of Numbers Here].dat or run the command Outlook /cleanautocompletecache to clean server-side copy of cache.

3. Have you tried clearing the Autocomplete list? Go to File > Options > Mail > Send Messages > Empty Auto-Complete List.

We look forward to hearing from you, please let me know and provide a more detailed description so we can provide you with more specific assistance. Thank you for your cooperation.

Sincerely,

De Paul | Microsoft Community Moderator

outlook for Microsoft 365 v 2301 16.0.16026.20002

I have not tried deleting the cache. will doing this erase the auto complete entries that are currently functioning?

I have not tried clearing the auto complete list either. The problem with this is that several hundred auto complete entries would be lost as part of the clearing, is that correct?

I have the exact same problem and it started on Friday April 7 2023 after Microsoft had an issue with Sent messages not being sent even though they were in the Sent Folder. That got fixed and now I am unable to have ONE address add to the autocomplete. No matter how many times I send her a message, her email address won't stick in the autocomplete.

following up on my reply. is there a way to keep the auto complete list in tact and repair the one entry that won't save?

Would love to know if a solution to this has been found.

Hi Nick

No one ever gave me a good solution. I used the HELP, Contact Support, button within Outlook 365 and they had me try everything but nothing worked. I ended up exporting my contacts to a .csv file. Then I deleted my .pst and .ost and all the files/folders related to Outlook, hacked them out of the registry. Then I did a REPAIR on Microsoft Office. I basically started from scratch with a new Outlook profile, imported my contacts, and so far, so good.

Good luck,

Barbara