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MC1131777 Plan for changeUpdated messageUser impactAdmin impact

Outlook for iOS: Minimum system requirements updated to iOS 18 and above

From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.
Microsoft 365 suiteMicrosoft 365 apps
Microsoft 365 admin center

Rollout

Rollout dates are often only in the text. When Microsoft moves them, the change shows under "What changed".

Schedule dates changed in the text

Date phrases in schedule sentences differ between the versions this installation saw
  • Seen 9 Sep 2025 early September 2025

Read from date phrases in Microsoft's text, not from notice metadata. A changed phrase can be a moved rollout, a new milestone or just rewording; "What changed" below shows which.

What the notice says

Microsoft’s text, safely structured

Updated September 9, 2025: We have updated the timeline. Thank you for your patience.

Introduction

To ensure optimal performance and security, Outlook for iOS will update its minimum supported operating system requirements. Following the release of iOS 26, Outlook for iOS will only support the two most recent versions of iOS, iPadOS, and watchOS. This change aligns with Microsoft’s commitment to supporting the latest Apple platforms.

When this will happen

Rollout will begin in late September 2025 (previously early September) and is expected to complete by late September 2025.

How this affects your organization

Once iOS 26 is generally available:

  • Outlook for iOS will no longer receive updates on devices running iOS 17 or earlier.
  • Users on iOS 17 can continue using the last supported version of Outlook, but over time, the app may stop syncing email and calendar data.
  • iPadOS 17 and watchOS 10 will also be retired. Supported versions will include iPadOS 18 and 26, and watchOS 11 and 26.
  • This change does not affect users running iOS 18 or later.

What you can do to prepare

  • Notify users of the upcoming OS requirement changes.
  • Encourage users to upgrade their devices to iOS 18 or later to continue receiving Outlook updates and ensure uninterrupted service.

Compliance considerations

No compliance considerations identified, review as appropriate for your organization.

What changed

Between archive captures, newest first
    • Tags User impact, Admin impact → Updated message, User impact, Admin impact

    Updated September 9, 2025: We have updated the timeline. Thank you for your patience. Introduction To ensure optimal performance and security, Outlook for iOS will update … the latest Apple platforms. When this will happen Rollout will begin in earlylate September 2025 (previously early September) and is expected to complete by late September 2025. How this affects …

  2. · first version seen

No related evidence found in this installation's recent collection. This does not establish that no announcement exists.

Not confirmed here

What this page cannot tell you
  • Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.
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