From: winstonmvp@gmail.com   
      
   On 1/6/2026 8:13 AM, Graham J wrote:   
   > Google suggests:   
   >   
   > Start a new email   
   > Type the first few characters of the relevant email address into the   
   > "To:" field.   
   >   
   > The AutoComplete function will show all the matching entries.  Select   
   > the one you wish to delete (using mouse or keyboard).  Delete it using   
   > the "Delete" key or by clicking the cross to its right.   
   >   
   > In all previous versions of Outlook this has worked.   
   >   
   > But in Outlook 365 the selected email address is not deleted.   
   >   
   > Anybody know how to resolve this, please?   
   >   
   >   
      
   Outlook 365   
     Desktop(Classic)?   
     Outlook(new) - optional UI in Desktop(Classic) edition?   
     Outlook 365 mobile app?   
     Outlook 365(Microsoft 365) for business edition?   
      
   Outlook 365 installed version/build?   
     M365 Apps for Windows Current Channel(applies to Enterprise, Apps for   
   Business)   
     - latest is Version 2511 (Build 19426.20218)   
     M365 Monthly Enterprise Channel   
     - latest is Version 2510 (Build 19328.20266)   
     M365 Semi-Annual Enterprise Channel   
     - latest is Version 2502 (Build 18526.20672)   
      
     M365 Desktop(Classic) - Personal and Family edition   
     - latest can be any of these three due to the staged rollout(not all   
   deployed to every client at the same time)   
      Version 2512 (Build 19530.20108) Dec. 29 2025   
      Version 2512 (Build 19530.20082) Dec. 23 2025   
      Version 2512 (Build 19530.20074) Dec. 18 2025   
      
      
   On this device, M365 Family (Outlook Desktop[Classic])   
     =>  2512 Build 19530.20074   
     -  Autocomplete entries appear in a separate dialog box(each item can   
   be deleted using the Delete key or selecting the entry in the dialog box   
   and clicking the 'X')   
   On another device(same M365 Family edition, same Microsoft account)   
     =>  2512 (Build 19530.20108)  i.e. same product, same account, later   
   deployed Build.   
      -  Exact same results - Autocomplete entries appear in a separate   
   dialog box(each item can be deleted using the Delete key or selecting   
   the entry in the dialog box and clicking the 'X')   
      
   You might try resetting Autocomplete - toggle off, close Outlook,   
   restart device, logon, open Outlook, toggle on.   
      
   Also, if more than one email address(using Exchange or IMAP) is   
   configured in Outlook ensure that your Autocomplete concern exists in   
   each account(they each have their own email address contact list). POP3   
   configured accounts default to the built-in default Contacts(in   
   Outlook.pst).   
      
      
      
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