MC1125491 | (Updated) Microsoft Outlook for Windows: Add attachments while offline

Service

Exchange Online, Microsoft 365 apps

Last Updated

2026-06-05T21:41:55.027Z

Published

2025-07-30T23:48:11Z

Message ID

MC1125491

Updated June 5, 2026: We have updated the timeline. Thank you for your patience. Introduction We’re enhancing offline functionality in the new Microsoft Outlook for Windows. This update (Microsoft 365 Roadmap ID 496371) enables users to add file attachments while composing emails offline, improving productivity for those working without an internet connection. When this will happen • Targeted Release (Worldwide): Rollout begins in late October 2025 and is expected to complete by late March 2026 (previously late November 2025). • General Availability (Worldwide): This is now currently available. • General Availability (GCC): Rollout begins in early June 2026 (previously early May) and is expe...

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