check before: 2026-03-30
Product:
Exchange, Microsoft 365 suite, Outlook, Purview, Purview Communication Compliance, Purview Information Barriers
Platform:
mobile, Online, Web, Windows Desktop, World tenant
Status:
Change type:
User impact, Admin impact, Retirement
Links:
Details:
Summary:
Outlook will retire the "Contact Masking" feature, which hides suggested recipients, on March 31, 2026. Hidden contacts may reappear in suggestions, with no replacement feature provided. No admin action is required, but users should be informed and training updated accordingly.
Details:
[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.
Change Category:
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Scope:
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Release Phase:
Created:
2026-02-19
updated:
2026-02-19
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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Pictures
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summary for non-techies**
Microsoft will retire the "Contact Masking" feature in Outlook by March 31, 2026, causing previously hidden contacts to reappear in suggestions, with no replacement feature planned, due to user confusion and compliance challenges.
Direct effects for Operations**
Reappearance of Hidden Contacts
Previously hidden suggested recipients may reappear in email addressing suggestions, leading to potential confusion and privacy concerns for users.
- roles: End Users, Compliance Officers
- references: https://learn.microsoft.com/exchange/address-books/address-book-policies/address-book-policies, https://support.microsoft.com/office/manage-suggested-recipients-in-the-to-cc-and-bcc-fields-in-outlook-dbe46e31-c098-4881-8cf7-66b037bce23e
User Confusion
Users may experience confusion when previously hidden contacts reappear, impacting their email addressing experience and potentially leading to miscommunication.
- roles: End Users, Helpdesk Staff
- references: https://learn.microsoft.com/exchange/address-books/address-book-policies/address-book-policies, https://support.microsoft.com/office/manage-suggested-recipients-in-the-to-cc-and-bcc-fields-in-outlook-dbe46e31-c098-4881-8cf7-66b037bce23e
Training Material Updates
Internal training and helpdesk materials will need to be updated to reflect the removal of the contact masking feature, requiring additional resources and time.
- roles: Training Coordinators, Helpdesk Staff
- references: https://learn.microsoft.com/exchange/address-books/address-book-policies/address-book-policies, https://support.microsoft.com/office/manage-suggested-recipients-in-the-to-cc-and-bcc-fields-in-outlook-dbe46e31-c098-4881-8cf7-66b037bce23e
Inconsistent User Experience
The removal of contact masking may lead to an inconsistent user experience across Microsoft 365 applications, as users may expect similar behavior in other apps.
- roles: End Users, IT Support
- references: https://learn.microsoft.com/exchange/address-books/address-book-policies/address-book-policies, https://support.microsoft.com/office/manage-suggested-recipients-in-the-to-cc-and-bcc-fields-in-outlook-dbe46e31-c098-4881-8cf7-66b037bce23e
Privacy Concerns
The reappearance of hidden contacts could raise privacy concerns among users, especially if sensitive contacts are inadvertently suggested.
- roles: End Users, Compliance Officers
- references: https://learn.microsoft.com/exchange/address-books/address-book-policies/address-book-policies, https://support.microsoft.com/office/manage-suggested-recipients-in-the-to-cc-and-bcc-fields-in-outlook-dbe46e31-c098-4881-8cf7-66b037bce23e
Configutation Options**
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Potentional Risks**
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IT Security**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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Last updated 3 weeks ago ago
