💡 Our Technical Review in summary
- Microsoft is retiring the “Contact Masking” feature in Outlook, which currently allows users to hide suggested recipients by clicking the “X” next to a name in the To, Cc, or Bcc fields.
- This change is scheduled to take effect on March 31, 2026.
- The retirement aims to resolve cross-app inconsistencies and user confusion caused by local masking settings that do not align with global contact entity management or compliance standards.
#### Impact
- User Experience: After the retirement date, any contacts previously “hidden” or “masked” by users will reappear in the Auto-Complete list, People suggestions, and Search results.
- Platform Scope: This affects all versions of Outlook, including Desktop (Windows/Mac), Web (OWA), and Mobile (iOS/Android).
- Inconsistency Resolution: Masking previously applied to several Microsoft 365 experiences despite being managed only within Outlook; this retirement ensures a uniform experience across the suite.
- No Replacement: Microsoft is not introducing a direct user-level replacement for the “X” (hide) functionality in the suggestion list.
#### Action Required
- Internal Documentation: Update internal training manuals, Knowledge Base articles, or helpdesk “how-to” guides that currently instruct users to hide recipients using the “X” button.
- User Communication: Inform users that previously hidden suggestions may reappear in their addressing fields starting April 2026.
- Administrative Controls: If your organization requires specific contacts or groups to be hidden for compliance or organizational reasons, use official admin-level tools instead of relying on user-level masking:
- Address Book Policies (ABPs): To segment the Global Address List.
- Information Barriers: To restrict communication between specific groups in Microsoft Purview.
- GAL Hiding: Use the
HiddenFromAddressListsEnabledattribute in Exchange Online to hide specific recipients from the entire organization.
Microsoft Official Update
Service: N/A
Category: planForChange
Severity: normal
[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.
[When this will happen]
Contact masking will reach end of support on March 31, 2026.
[How this affects your organization]
Who is affected
- All Outlook users (Desktop, Web, Mobile) who previously hid suggested recipients
[Why we’re making this change]
This feature has been a recurring source of customer confusion and escalations, because contacts can be accidentally hidden for one user but not others.
While the impact is felt across Microsoft 365 experiences (not just Outlook). It also isn’t managed as a contact entity setting, which creates transparency and compliance challenges.
[What will change in user experience]
- Previously hidden (masked) suggested recipients may reappear in:
- Addressing (To/Cc/Bcc suggestions)
- People suggestions
- Search
- No new feature will replace contact masking for users.
- The retirement resolves inconsistent cross‑app behavior, as masking previously applied beyond Outlook even though it was not a suite‑level contact setting.
[Is Admin Action Required?]
No action is required for this retirement. You may choose to:
- Inform users that any previously hidden suggestions may reappear after March 31, 2026.
- Update internal training or helpdesk materials if they reference contact masking.
- Review related admin controls that remain available for managing visibility and segmentation:
- Address Book Policies (ABPs): Address book policies in Exchange Online | Address Books | Exchange Online | Microsoft Learn
- Microsoft Purview Information Barriers: Learn about Information Barriers | Microsoft Purview | Microsoft Learn
- Hide recipients from Global Address List / GAL (HiddenFromAddressListsEnabled): Hide recipients from address lists – Manage address lists in Exchange Online | Address list procedures | Microsoft Learn
Learn more about the retiring feature: (RETIRING March 31, 2006) Manage suggested recipients in the To, Cc, and Bcc fields in Outlook | Microsoft Support
[Compliance considerations]
No compliance considerations identified. Review as appropriate for your organization guidance to users on user level features.
