Microsoft to Replace Outlook for Mac With New Universal Client

Microsoft is planning to replace Outlook for Mac with a new web-based universal Outlook client, according to Windows Central.

microsoft outlook web app

Months after announcing a complete redesign of Outlook for Mac, Microsoft is reportedly intending to scrap its current Mac app and replace it with a new client based on the Outlook web app.

Codenamed "Monarch," the project is Microsoft's attempt to build a single Outlook client across Windows, Mac, and the web. The new client will also replace the default Mail and Calendar apps on Windows 10 and unify Microsoft's entire selection of Outlook apps.

Project Monarch is said to be based on the pre-existing Outlook web app, offering the best indication of how the replacement app will look and function when it is released. While there will apparently be some native OS integrations for the likes of offline storage and notifications, the overall goal is to remain as universal as possible across platforms.

The change allows Microsoft to use the same codebase for apps on all devices, helping it to streamline development. For users, the new single client would be smaller in size and offer the same user experience across all devices.

Microsoft will reportedly begin to preview its new Outlook client toward the end of 2021, and plans to replace the Mail and Calendar apps in Windows 10 in 2022. Outlook for Mac will presumably be deprecated at some point during this timeframe.

Popular Stories

iOS 26

iOS 26.1 Coming Soon: New Features for Your iPhone and Release Date

Monday October 27, 2025 7:55 am PDT by
The upcoming iOS 26.1 update includes a handful of new features and changes for iPhones, including a toggle for changing the appearance of the Liquid Glass design, "slide to stop" for alarms in the Clock app, and more. Below, we outline key details about iOS 26.1. Release Date Given that Apple has yet to seed an iOS 26.1 Release Candidate, which is typically the final beta version, the...
iOS 26

6 New Things Your iPhone Can Do in iOS 26.1

Wednesday October 29, 2025 4:22 am PDT by
Apple is about to drop iOS 26.1, the first major point release since iOS 26 was rolled out in September, and there are at least six notable changes and improvements to look forward to. We've rounded them up below. Apple has already provided developers and public beta testers with the release candidate version of iOS 26.1, which means Apple will likely roll out the update to all compatible...
maxresdefault

Apple TV 4K Could Still Launch Before 2025 Ends: All the Rumored Features

Monday October 27, 2025 4:51 pm PDT by
Apple is designing an updated version of the Apple TV 4K, and rumors suggest that it could come out sometime in the next couple of months. We're not expecting a major overhaul with design changes, but even a simple chip upgrade will bring major improvements to Apple's set-top box. Subscribe to the MacRumors YouTube channel for more videos. We've rounded up all the latest Apple TV rumors. ...
iOS 26

Apple Seeds iOS 26.1, iPadOS 26.1, and macOS Tahoe 26.1 Release Candidates

Tuesday October 28, 2025 1:07 pm PDT by
Apple today provided developers and public beta testers with the release candidate versions of upcoming iOS 26.1, iPadOS 26.1, macOS Tahoe 26.1, tvOS 26.1, watchOS 26.1, and visionOS 26.1 updates for testing purposes. The RCs betas come a week after Apple released the fourth betas. The new betas can be downloaded from the Settings app on a compatible device by going to General > Software...
M6 MacBook Pro Feature 1

M6 MacBook Pro: Release Date, Pricing, and What to Expect

Monday October 27, 2025 9:15 am PDT by
Apple this month refreshed the 14-inch MacBook Pro base model with its new M5 chip, and higher-end 14-inch and 16-inch MacBook Pro models with M5 Pro and M5 Max chips are expected to follow in early 2026. However, these machines will represent the final update to the current design, with Apple reportedly developing a completely new version of the MacBook Pro packed with next-generation hardware...
iPhone 17 Pro Cosmic Orange

8 Reasons to Wait for Next Year's iPhone 18 Pro

Thursday October 30, 2025 4:42 am PDT by
Apple's iPhone development roadmap runs several years into the future and the company is continually working with suppliers on several successive iPhone models at the same time, which is why we often get rumored features months ahead of launch. The iPhone 18 series is no different, and we already have a good idea of what to expect for the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth...
macos tahoe

Here Are Apple's Release Notes for macOS Tahoe 26.1

Tuesday October 28, 2025 1:21 pm PDT by
Apple today provided developers and public beta testers with the release candidate version of macOS Tahoe 26.1, which means the update will likely see a public launch next week. The release candidate includes notes on what's in the update, so we have a full picture of the new features that Apple has included. macOS Tahoe 26.1 adds AutoMix support over AirPlay, improved FaceTime audio...
ipad mini 7 feature blue

OLED iPad Mini: Release Date, Pricing, and What to Expect

Wednesday October 29, 2025 7:13 am PDT by
Rumors are stoking excitement for the next-generation iPad mini that Apple is reportedly close to launching. So what should we expect from the successor to the iPad mini 7 that Apple released over a year ago? Read on to find out. Processor and Performance Apple is working on a next-generation version of the iPad mini (codename J510/J511) that features the A19 Pro chip, according to...
iPhone Car Key Kia

Another Vehicle Brand Gaining iPhone Car Keys Support

Tuesday October 28, 2025 5:27 am PDT by
Apple is preparing to bring support for its digital car key feature to Jetour vehicles, according to evidence uncovered on Apple's backend by MacRumors contributor Aaron Perris. Introduced in 2022, Car Keys allows an iPhone or Apple Watch to unlock a vehicle through the Wallet app. A digital version of a car key is stored in Wallet, and unlocking can be done by holding an Apple Watch or...

Top Rated Comments

MakeAppleAwesomeAgain Avatar
63 months ago
It would be nice if they'd make up their mind for once and not completely change Outlook every 2-3 years.
Score: 57 Votes (Like | Disagree)
SteveAbootman Avatar
63 months ago
If I wanted the web experience for Outlook, I'd open my web browser.
Score: 50 Votes (Like | Disagree)
ruka.snow Avatar
63 months ago
This sounds like a terrible move that'll take away a rather performant app and replace it with some electron garbage. The only plus side being that could open itself to an easy Linux client.
Score: 49 Votes (Like | Disagree)
jgbr Avatar
63 months ago
Unacceptable. I don’t want a web app. I want a responsive locally hosted secure application. Stop ruining apps.
Score: 44 Votes (Like | Disagree)
adepew Avatar
63 months ago
Why is it so hard to make Outlook on Mac function like Outlook on Windows? No one wants this watered down web experience.
Score: 38 Votes (Like | Disagree)
DreamyLucid Avatar
63 months ago
So I am expecting subscription prices to go down after the launch of this.
Score: 18 Votes (Like | Disagree)