Microsoft to Open Source .NET Stack, Expand Platform to OS X, Linux - MacRumors
Skip to Content

Microsoft to Open Source .NET Stack, Expand Platform to OS X, Linux

by

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
156 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)
156 months ago
This seems huge, Nadella is killing it.
Score: 21 Votes (Like | Disagree)
talmy Avatar
156 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)
156 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
156 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)
156 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 TV 4K HomeView HomePod Mini tweaked

New Apple TV 4K, HomeView, and HomePod Mini: 16 Details Just Leaked

Sunday October 11, 2026 12:56 pm PDT by
Just two days before Apple's "Welcome home" experience in New York, Bloomberg's Mark Gurman has leaked several details about the new products set to be unveiled, including an all-new smart home hub, a HomePod mini 2, and a new Apple TV 4K. Here is an all-in-one summary of the details shared by Gurman:Apple's home hub with a touch-enabled display will be named HomeView, seemingly confirming a ...
apple welcome home event

Apple Product Launch Announced for October 13: 'Welcome Home'

Thursday October 8, 2026 9:04 am PDT by
Apple today announced an upcoming product launch that will take place on Tuesday, October 13. We are expecting Apple's announcement to focus on new smart home products, including the long-rumored smart home hub, a new Apple TV 4K, and a refreshed HomePod mini. Subscribe to the MacRumors YouTube channel for more videos. The home hub is an all-new device that's like a cross between an iPad and...
MacBook Pro Ultra Feature 1

Apple to Launch Touchscreen OLED MacBook Pro and OLED iPad mini on October 27

Thursday October 8, 2026 1:31 pm PDT by
Apple will introduce new OLED touchscreen MacBook Pro models and an OLED iPad mini "on or around" Tuesday, October 27, reports Bloomberg. The launch will also include an M6 14-inch MacBook Pro and an M6 iMac. The October 27 follows Apple's October 13 debut of a new smart home hub, a revamped Apple TV 4K, and a refreshed HomePod mini. Earlier this month, MacRumors reported that Apple would do ...
Latest Stories
OLED iPad Mini Could Be $200 More Expensive Than Current Model
OLED iPad Mini Could Be $200 More Expensive Than Current Model
2 hours ago
Apple Launches Special Edition AirPods 5 in India
Apple Launches Special Edition AirPods 5 in India
3 hours ago
New Apple TV 4K and HomePod Mini 2 Pre-Orders Expected to Begin This Week
New Apple TV 4K and HomePod Mini 2 Pre-Orders Expected to Begin This Week
10 hours ago
New Apple TV 4K, HomeView, and HomePod Mini: 16 Details Just Leaked
New Apple TV 4K, HomeView, and HomePod Mini: 16 Details Just Leaked
17 hours ago
New Entry-Level iPad Not Expected Until Early 2027
New Entry-Level iPad Not Expected Until Early 2027
21 hours ago
Apple Plans Major iPhone Duo Retail Showcase, But Supply Will Be Limited
Apple Plans Major iPhone Duo Retail Showcase, But Supply Will Be Limited
22 hours ago
Apple TV 4K Getting A19 Chip and a Potentially Easier-to-Find Siri Remote
Apple TV 4K Getting A19 Chip and a Potentially Easier-to-Find Siri Remote
22 hours ago
New Mac Mini and Mac Studio Receive Up to $200 Price Cuts at Amazon
New Mac Mini and Mac Studio Receive Up to $200 Price Cuts at Amazon
23 hours ago
Apple HomeView Smart Hub to Ship in Mid-November in Four Colors
Apple HomeView Smart Hub to Ship in Mid-November in Four Colors
22 hours ago
New Apple TV 4K and HomePod Mini to Ship on October 30
New Apple TV 4K and HomePod Mini to Ship on October 30
23 hours ago
AirPods Max 2 Available for $429 in All Colors on Amazon
AirPods Max 2 Available for $429 in All Colors on Amazon
23 hours ago
Rumor: Apple to Announce New Partnership With ADT
Rumor: Apple to Announce New Partnership With ADT
1 day ago
AirPods 5 vs. AirPods 5 With Wireless Charging Case Buyer's Guide
AirPods 5 vs. AirPods 5 With Wireless Charging Case Buyer's Guide
2 days ago
Accessory Deals This Weekend: Save on TVs, Headphones, and Smart Home Gear
Accessory Deals This Weekend: Save on TVs, Headphones, and Smart Home Gear
2 days ago
Apple's All-New Home Hub Will Be Revealed October 13: What to Expect
Apple's All-New Home Hub Will Be Revealed October 13: What to Expect
2 days ago
Apple Announcing HomePod Mini 2 Next Week With These New Features
Apple Announcing HomePod Mini 2 Next Week With These New Features
2 days ago
A New Apple TV 4K is Finally Coming on Tuesday
A New Apple TV 4K is Finally Coming on Tuesday
2 days ago
Top Stories: Apple's 'Welcome Home' Launch on October 13 and More
Top Stories: Apple's 'Welcome Home' Launch on October 13 and More
2 days ago
Apple Stores Will Add Your Name to iPhone Duo's Startup Screen
Apple Stores Will Add Your Name to iPhone Duo's Startup Screen
3 days ago
SpaceX Inches Closer to Becoming a U.S. Carrier
SpaceX Inches Closer to Becoming a U.S. Carrier
3 days ago
Apple Potentially Behind 'HomeView' Trademark Filed Alongside 'homeOS' Last Year
Apple Potentially Behind 'HomeView' Trademark Filed Alongside 'homeOS' Last Year
3 days ago
Mark Your Calendar: Six Important Apple Dates Coming Up This Month
Mark Your Calendar: Six Important Apple Dates Coming Up This Month
3 days ago
MacRumors Giveaway: Win an Apple Watch Series 12 and a Nylon Band From Southern Straps
MacRumors Giveaway: Win an Apple Watch Series 12 and a Nylon Band From Southern Straps
3 days ago
First Apple TV 4K Now 'Vintage' Ahead of New Model Coming on Tuesday
First Apple TV 4K Now 'Vintage' Ahead of New Model Coming on Tuesday
3 days ago
The MacRumors Show: Apple's Smart Home Products Are Coming
The MacRumors Show: Apple's Smart Home Products Are Coming
3 days ago
Apple Shares Fall After News of iPhone 18 Pro Order Cuts
Apple Shares Fall After News of iPhone 18 Pro Order Cuts
3 days ago
Leak Details iPhone Features for Apple's LG Home Accessories
Leak Details iPhone Features for Apple's LG Home Accessories
3 days ago
Prime Day Leftover Deals: AirPods Max 2 for $429, Mac Mini for $779.99, and More
Prime Day Leftover Deals: AirPods Max 2 for $429, Mac Mini for $779.99, and More
3 days ago
Every M5 MacBook Air Now $200 Off on Amazon
Every M5 MacBook Air Now $200 Off on Amazon
3 days ago
Mac Shipments Fall, But Apple Still Gains Ground in Shrinking Market
Mac Shipments Fall, But Apple Still Gains Ground in Shrinking Market
3 days ago