Microsoft today announced that it is furthering its commitment to cross-platform development with an expanded open source program for its .NET platform and additional support for operating systems outside of Microsoft Windows.

"With billions of devices in the market today, developers need tools that target many different form factors and platforms," said S. Somasegar, corporate vice president, Developer Division, Microsoft. "Through Visual Studio and .NET we are committed to delivering a comprehensive end-to-end solution for developers to build and manage applications across multiple devices and platforms."

After releasing several .NET libraries earlier this year to the open source community, Microsoft confirmed it would open source the full server .NET stack, making it available to developers via Github. The company also is expanding .NET to run on third-party platforms such as Linux and OS X and is working with the open source Mono project to ensure these cross-platform operations are ready for enterprise-level applications.

Microsoft-dotNET-logo
As part of its Connect() event, Microsoft also unveiled its next generation Visual Studio 2015 developer suite with expanded cross-platform support. Additionally, the Redmond company announced the immediate release of Visual Studio Community 2013 and Visual Studio 2013 Update 4.

This open source initiative is part of a broader campaign to support platforms outside of Windows and Windows Phone. The company now offers Office on the iPhone and iPad and is continuing its support for Apple's OS X platform. An updated version of Office for Mac is rumored for release sometime in 2015.

Top Rated Comments

macduke Avatar
144 months ago
So to recap, Microsoft is going open source and free with some of their products, Google is moving towards closed source with parts of Android, and Apple is now selling phablets faster than they can make them. Also my iPad is now as fast as a MacBook Air. What kind of alternate reality tech world have I suddenly stumbled into?
Score: 37 Votes (Like | Disagree)
flash84x Avatar
144 months ago
This seems huge, Nadella is killing it.
Score: 21 Votes (Like | Disagree)
talmy Avatar
144 months ago
.Net was suppose to be a cross platform language

In Microsoft-speak, "cross platform" means it will run on different versions of Windows. I'm not joking.
Score: 18 Votes (Like | Disagree)
mrfoof82 Avatar
144 months ago
This seems huge, Nadella is killing it.

.NET is actually a joy to work with. Being able to write apps in C# for OS X has been a dream for a lot of developers. It's a very lovely language and supporting framework.

I don't mind Objective-C. I like Swift (a lot). Though being able to use C# on OS X and have first-party support and tools from Microsoft would make me a very happy camper.
Score: 8 Votes (Like | Disagree)
thejadedmonkey Avatar
144 months ago
I wouldn't call this Microsoft going open source. This is them making it easier for themselves to release clients to other operating systems without having to create a completely native client. Also allowing people to leverage their technology in other software...the end game is that Microsoft is not counting on Windows anymore but are still very much a paid software company.

How much more "open source" than the MIT license can they possibly go?
Score: 6 Votes (Like | Disagree)
LogicalVue Avatar
144 months ago
Not what you think

It seems like most of you should have first read the actual MS announcement.

This announcement says that their server-side .NET framework will be eventually able to run on Linux and OS X. Linux matters for servers, but OS X is not all that relevant. This announcement has nothing to do with desktop GUI apps. It's all about the server and enterprise. Relevant quote:

Delivering on its promise to support cross-platform development, Microsoft is providing the full .NET server stack in open source, including ASP.NET, the .NET compiler, the .NET Core Runtime, Framework and Libraries, enabling developers to build with .NET across Windows, Mac or Linux. Through this implementation, Microsoft will work closely with the open source community, taking contributions for future improvements to .NET and will work through the .NET Foundation.

“A strong, open source, cross-platform CLR opens significant new options for building large server-based systems,” said Brian McCallister, chief technology officer, Groupon. “This significantly expands the choices developers have when finding the right tool to solve their problem. I’m very excited to have access to the quality virtual machine and tooling of the CLR without having to completely rework our production infrastructure in order to run it!”

There is also nothing in this announcement about allowing you to write .NET software using a Mac. MS does not have a Mac IDE and I don't expect them to create one either.

This is a good direction for Microsoft and .NET, but unless you are an enterprise software developer using .NET, this announcement will not affect you in any way.
Score: 4 Votes (Like | Disagree)

Popular Stories

Apple Shopping Event 2025

Apple Announces 2025 Black Friday Event, Here's What You Can Get

Thursday November 20, 2025 6:28 am PST by
Apple's annual four-day Black Friday through Cyber Monday shopping event is returning on Friday, November 28 through Monday, December 1 in many countries, including the United States, Canada, Australia, New Zealand, France, Germany, Italy, Spain, the United Kingdom, Belgium, the Netherlands, Sweden, Thailand, and others. During the shopping event, customers can get an Apple gift card with...
iOS 26

iOS 26.2 Adds These New Features to Your iPhone

Thursday November 20, 2025 10:50 am PST by
iOS 26.2 is currently in beta testing. The upcoming update includes a handful of new features and changes on the iPhone, including a new Liquid Glass slider for the Lock Screen's clock, offline lyrics for Apple Music, and more. In a recent press release, Apple confirmed that iOS 26.2 will be released to all users in December, but it did not provide a specific release date. Keep reading...
iPhone 17 Pro Cosmic Orange

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

Wednesday November 19, 2025 4:00 am PST 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...
hikawa phone grip stand apple%402x

Apple Launches Second Limited-Edition iPhone Accessory in a Month

Friday November 21, 2025 3:53 am PST by
Apple has begun selling the Hikawa Phone Grip and Stand, a new limited-edition iPhone accessory designed with accessibility in mind. Designed by LA-based Bailey Hikawa to celebrate the 40th anniversary of accessibility at Apple, the grip uses magnets to securely snap onto any iPhone with MagSafe. Apple says it can be removed with ease, and doubles as a stand with two different viewing...
ipad mini 7 feature red and blue

iPad Mini 8: Four Major New Features to Expect

Wednesday November 19, 2025 7:50 am PST by
Apple's eighth-generation iPad mini is highly likely to arrive next year, offering a significant refresh of the device with at least four major new features. OLED Display The next-generation version of the iPad mini could feature an OLED display, as part of Apple's plan to expand the display technology across many more of its devices. Apple's first OLED device was the Apple Watch in 2015, ...
ipad black friday 2025

The Best Early Black Friday iPad Deals

Thursday November 20, 2025 10:20 am PST by
Black Friday is just over a week away, and iPad deals have finally started to flood in at retailers like Amazon and Best Buy. Below we're tracking discounts on every current generation iPad, including lowest-ever prices on M3 iPad Air and M5 iPad Pro, plus steep markdowns on iPad and iPad mini. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a ...
watchos 26 workout app

Apple Watch Users Claim Workout App Is Now Worse in Every Way

Thursday November 20, 2025 7:01 am PST by
Apple Watch owners have been voicing their frustration online over changes to the Workout app that Apple introduced in watchOS 26, with many finding the redesigned interface makes starting exercises difficult and exasperating. When Apple launched watchOS 26 in September, the Workout app went from large, easily tapped workout tiles to a scrolling, corner-button interface. Instead of tapping a ...
applecare apple care banner

Apple Brings New AppleCare+ Options to India

Tuesday November 18, 2025 8:42 am PST by
Apple today announced an expansion of AppleCare+ coverage in India, with new options for monthly and annual plans, and the addition of Theft and Loss for iPhone for the first time. Options for monthly and annual AppleCare+ plans in India provide more choice and flexibility, allowing users to keep coverage for as long as they require. Apple's vice president of Worldwide iPhone Product...
apple wallet drivers license feature iPhone 15 pro

Two More U.S. States Commit to Offering iPhone Driver's Licenses in Apple Wallet App

Thursday November 20, 2025 8:21 am PST by
In select U.S. states, residents can add their driver's license or state ID to the Apple Wallet app on the iPhone and Apple Watch, and then use it to display proof of identity or age at select airports and businesses, and in select apps. Earlier this week, Illinois became the 13th state in the U.S. to offer the feature. Subsequently, we shared a list of additional states that are committed...