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“This spring” meant spring 2022. The January 24, 2022 report about Microsoft’s delayed Project Monarch described the company’s plan to bring its unified, web-based Outlook experience to testing. Monarch was not abandoned: it eventually became new Outlook for Windows, which reached general availability on August 1, 2024. As of 2026, Microsoft is still managing a staged migration from classic Outlook rather than completing a single, universal replacement.
What Project Monarch was supposed to be
Project Monarch was one of Microsoft’s internal names for the initiative also known as One Outlook. Its goal was to reduce the longstanding split between Microsoft’s Outlook products by building a more consistent experience around a shared, web-oriented foundation.
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The original scope described in the 2022 report included Windows desktop, the web, and macOS. The project was intended to bring the Outlook experience closer to Outlook.com and Outlook on the web while using a common codebase across platforms. Microsoft later presented the same broader direction as a modern Windows Outlook experience with faster feature delivery and a shared foundation.
Monarch was primarily a client and user-interface project. It was not a replacement for Exchange Online, Outlook.com’s mail infrastructure, or the email service provided by a Microsoft 365 organization. The distinction matters: Microsoft was changing how users accessed their mail, calendars, contacts, and related services, not replacing the underlying mailbox service.
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The eventual Windows product became new Outlook for Windows.
Why was Project Monarch delayed?
The project was originally expected sometime in 2021, but that target slipped into 2022. The January 24 report said Microsoft had been testing Monarch internally for months and was expanding testing to progressively larger groups of employees.
That establishes that the schedule moved and that Microsoft was still conducting extensive internal testing. It does not establish a definitive technical, staffing, or executive reason for the delay. Microsoft had not publicly confirmed the reported schedule or provided a verified explanation for why the original target was missed.
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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →The report said Microsoft expected to announce the project in spring 2022, with Windows Insider testing potentially beginning in late March or early April and broader Insider availability later in the year. Those were reported expectations, not a confirmed promise of a full public launch. The original report is available from Thurrott.
What happened after the 2022 report?
A pre-release One Outlook experience began appearing publicly in 2022, followed by wider testing and availability. Microsoft subsequently branded the Windows version as new Outlook for Windows.
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Microsoft’s migration documentation identifies August 1, 2024 as the date new Outlook for Windows moved out of preview and reached general availability. That was the major product milestone Monarch had been working toward, although general availability did not mean that every classic Outlook feature was already present.
Microsoft continues to develop new Outlook. Its release notes show ongoing work in areas including accounts, calendars, and AI-related capabilities, while the Microsoft 365 roadmap continues to list Outlook development.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteWhat happened to Windows Mail and Calendar?
One of the clearest practical consequences of Microsoft’s Outlook strategy was the retirement of the Windows Mail, Calendar, and People applications. Microsoft ended support for those apps on December 31, 2024. After that date, users could no longer send or receive messages or events through the legacy applications.
Microsoft directed affected users toward new Outlook for Windows or Outlook.com. Users with local content should follow Microsoft’s documented export or migration procedures before relying on the legacy applications’ retirement guidance. This change should not be confused with the disappearance of every Outlook product: the Windows Mail apps reached their support deadline, while classic Outlook remains separately documented.
Is new Outlook the same as classic Outlook?
No. New Outlook is Microsoft’s strategic successor for Windows, but it is not simply a renamed copy of classic Outlook. Microsoft maintains a feature comparison because the two clients still differ in important areas.
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| Area | New Outlook | Classic Outlook |
|---|---|---|
| Product direction | Microsoft’s current Windows direction and the successor to Windows Mail and Calendar | Mature desktop Outlook that remains relevant for compatibility and advanced workflows |
| Interface | Modern and web-oriented | Traditional desktop Outlook interface |
| Availability | Microsoft Store, supported Windows installations, and eligible migration controls | Existing Microsoft 365 and perpetual Office installations, depending on licensing and policy |
| Feature coverage | Continues to expand, but some capabilities differ from classic Outlook | Broader support in some advanced and established desktop scenarios |
| Migration | Microsoft is progressively encouraging or automating migration for eligible users | Still needed where organizations or users depend on features not yet equivalent in new Outlook |
Differences can affect delegation and shared mailboxes, advanced enterprise workflows, add-ins, message recall, data-file and import features, security and encryption, offline behavior, and account-specific functionality. The exact result depends on the account, tenant, Windows installation, license, and Microsoft’s current feature support, so the comparison matrix is more reliable than a blanket claim about parity.
Who should switch to new Outlook?
Windows Mail and Calendar users
These users are the clearest audience for Microsoft’s migration path because support for the old applications ended in 2024. New Outlook is the replacement Microsoft provides for everyday mail and calendar use on supported Windows systems.
Basic personal email users
New Outlook is likely to meet the needs of users who mainly read and send mail, manage calendars, and connect common accounts. Microsoft supports Microsoft accounts, work or school accounts, and several third-party account types, including Gmail, Yahoo, iCloud, and IMAP-connected accounts. Feature coverage can vary by account type.
Microsoft 365 users with complex workflows
Users who rely on macros, specialized add-ins, detailed delegation, local data-file workflows, compliance tools, or other advanced classic Outlook features should check Microsoft’s comparison documentation before switching permanently.
Organizations and administrators
Businesses should evaluate administrator controls, account support, compliance requirements, offline needs, shared mailboxes, delegation, add-ins, and migration eligibility. Automatic switching is not universal; it depends on factors such as account type, subscription, update channel, and organizational policy.
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How to try new Outlook for Windows
Microsoft documents three main access routes:
- Use the “Try the new Outlook” toggle in an eligible classic Outlook or Mail and Calendar installation.
- Download new Outlook from the Microsoft Store.
- Open the preinstalled application on a supported Windows 11 device.
Full setup instructions are available in Microsoft’s Start using new Outlook for Windows guide.
The toggle will not appear in every edition or licensing configuration. Some non-subscription Office installations are among the configurations where the control may be unavailable. Work and school accounts can also be affected by administrator policy.
Microsoft says basic new Outlook use on supported Windows devices does not require a subscription. That does not mean every Outlook or Microsoft 365 capability is free: organizational desktop Outlook access and the services behind a work or school mailbox can require a qualifying license. Microsoft’s licensing guidance explains those distinctions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the Monarch transition means for different Outlook products
Several products are commonly—and incorrectly—treated as interchangeable:
- New Outlook for Windows: the Windows product that emerged from Project Monarch and One Outlook.
- Classic Outlook for Windows: the established desktop application, still relevant where its feature set or compatibility is required.
- Outlook on the web: the browser-based client for organizational Microsoft 365 accounts.
- Outlook.com: Microsoft’s consumer webmail service.
- Windows Mail, Calendar, and People: legacy Windows applications whose support ended December 31, 2024.
Therefore, saying “Microsoft replaced Outlook” is too broad. Microsoft replaced the Windows Mail and Calendar experience with a new Outlook path, while the transition from classic Outlook is progressive and conditional.
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Current status as of 2026
As of August 2026, Project Monarch is no longer an unreleased project. Its Windows successor, new Outlook for Windows, is generally available and is receiving continued development.
At the same time, classic Outlook remains separately documented, and Microsoft continues to publish feature differences between the two products. Some users are being encouraged or automatically moved to new Outlook under defined eligibility conditions, while organizations and users can still encounter policies or compatibility requirements that keep classic Outlook relevant.
Availability can also vary in specialized environments. Microsoft’s release notes identify environment-specific limitations, including restrictions affecting some government deployments. Users in those environments should confirm support rather than assuming that the consumer Windows experience applies unchanged.
The answer to the original headline
The January 24, 2022 report was directionally correct: Project Monarch had missed its original 2021 target, Microsoft was still expanding internal testing, and the next expected milestone was in spring 2022.
Monarch eventually shipped under the name new Outlook for Windows. Its long-term effect has been broader than a new app icon: Microsoft is consolidating several mail and calendar experiences around a modern Outlook client, retiring Windows Mail and Calendar, and gradually moving users away from classic Outlook. That migration is real, but it is not yet a feature-for-feature replacement in every account, organization, or workflow.
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