[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.