Summary: Outlook is retiring the “Contact Masking” feature on March 31, 2026, which allowed users to hide suggested recipients. Hidden contacts may reappear after this date. No admin action is required, and no replacement feature will be provided. The change resolves cross-app inconsistencies and confusion
What’s changing
In Outlook, users can hide a suggested recipient while addressing an email. For example, selecting the X next to a name in the To/Cc/Bcc suggestions list. This behaviour is commonly referred to as “Contact Masking”.
We are retiring this feature for users. This does not impact admin controls for contacts.
The AutoComplete list for Outlook will not be impacted by this change. Users can still remove entries from their autocomplete history (for example, suggestions based on past emails they typed). Contacts are not being added, deleted, or modified as part of this change. Email delivery and addressing continue to work as before.
When will this happen
Contact masking will reach the end of support on March 31, 2026.
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