outlook : Collapsable Message List

Release notes for Office for Mac

December 16, 2025

• Version 16.104 (Build 25121423)

Feature updates
Outlook

• Collapsable Message List: users can collapse or expand message groups for a cleaner, more organized view.

Resolved issues
Excel

• Quality and performance improvements.
  OneNote
• Quality and performance improvements.
  Outlook
• Quality and performance improvements.
  PowerPoint
• Quality and performance improvements.
  Word
• Quality and performance improvements.

Security updates
Excel

• CVE-2025-62556
• CVE-2025-62560
• CVE-2025-62561
• CVE-2025-62563
• CVE-2025-62564

Outlook

• CVE-2025-62562

Word

• CVE-2025-62555
• CVE-2025-62558
• CVE-2025-62559

Office Suite

• CVE-2025-62554
• CVE-2025-62557