• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
TechMicrosoft

Microsoft takes on ‘Silicon Valley darling’ Slack

By
Adam Lashinsky
Adam Lashinsky
Down Arrow Button Icon
By
Adam Lashinsky
Adam Lashinsky
Down Arrow Button Icon
September 23, 2015, 11:30 AM ET

Microsoft released its latest version of Office on Tuesday, Office 2016. The update includes revisions to the software company’s industry-leading “productivity” programs Word, Excel, PowerPoint, and Outlook. Microsoft (MSFT) says 1.2 billion people worldwide pay for these everyday content-creation tools. More and more of them are subscribing to Office’s online version, shorthanded as O365. As Barb Darrow noted on Fortune.com, Microsoft was more than a decade behind in locating the so-called cloud, that metaphorical place software programs now reside. But it most definitely is there now.

Microsoft also is getting decidedly faster at addressing the hot trends in tech. The central thrust of its new Office offering is a series of collaboration tools, including Groups, an application that lets Office users work with each other in real time on Office documents. It even integrates Skype so teammates can see each other as they work.

There was a time when Microsoft would ignore the trend of the moment and most certainly the leaders of the trend. No longer. The company knows who the collaboration leader is, a Silicon Valley company called Slack. “We see this as a kind of Slack killer for organizations that use Outlook,” says Chris Capossela, Microsoft’s chief marketing officer, in an interview coinciding with the launch of Office 2016. “Slack is small, but it’s big with startups,” Capossela said. “It’s a darling of Silicon Valley,” he adds, noting that major corporations with old and young employees, all using Microsoft’s Outlook email program, need a collaboration program that makes everyone comfortable.

Credit Microsoft for not taking this fight lying down. I’ve long maintained that Microsoft, not LinkedIn (LNKD), should have had the most useful contact-management applications, and I’ve been befuddled to watch Microsoft consistently refuse to take the bait LinkedIn dangled in front of it.

Scrappy Slack isn’t shying from a fight either. Reached by email, Stewart Butterfield, Slack’s founder and CEO, said: “We have 1.25 million daily users, 370,000 of which are paid. We have teams on many of the Fortune 500 companies, a near monopoly among news media and tech, do very well in creative industries, and we also have customers in government, including the State Department, General Services Administration, and NASA. We grew users by a factor of 10 over the last year and slightly faster in revenue. For the year ahead we expect to double both twice.”

Butterfield’s thoughts on Microsoft? “They have a four decade head start, but we’ll get there.”

Reflective of that four-decade legacy, Office remains a behemoth for Microsoft. It is its largest business at $24 billion in sales. Capossela says roughly 70% of Office customers are corporate. Consumers are important to the company, though. “We want the future CEOs of Facebook to be using Office.” Microsoft also has been abnormally active creative apps for Apple’s iOS platform. At 85 by its most recent count, Microsoft believes it’s the largest single iOS app developer.

Speedy, ubiquitous, clever, and feisty: Could this really be the Microsoft we knew and never totally loved before?

 

Microsoft says it is targeting Slack, but in this video Slack CEO Stewart Butterfield explains why he’s not out to kill email:

About the Author
By Adam Lashinsky
See full bioRight Arrow Button Icon

Latest in Tech

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Fortune Secondary Logo
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • World's Most Admired Companies
  • See All Rankings
  • Lists Calendar
Sections
  • Finance
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
  • Group Subscriptions
About Us
  • About Us
  • Press Center
  • Work At Fortune
  • Terms And Conditions
  • Site Map
  • About Us
  • Press Center
  • Work At Fortune
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Tech

Young man working on laptop with headphones in modern coffeeshop
Future of Workskills gap
AI generated identical résumés for a man and a woman: Hers was more likely to be labeled ‘weak,’ while his got a 97% approval rating
By Eleanor PringleMay 10, 2026
1 hour ago
UFO files show Buzz Aldrin saw a ‘sizeable’ object close to the moon and a ‘fairly bright light source’ that the Apollo 11 crew felt could be a laser
Innovationspace
UFO files show Buzz Aldrin saw a ‘sizeable’ object close to the moon and a ‘fairly bright light source’ that the Apollo 11 crew felt could be a laser
By Seung Min Kim, Collin Binkley and The Associated PressMay 9, 2026
19 hours ago
joaquin
Commentary250 Years of Innovation
Johnson & Johnson CEO: America’s innovation advantage starts with health 
By Joaquin DuatoMay 9, 2026
22 hours ago
Qualcomm’s CEO is working with ‘pretty much all’ major AI players on top-secret devices—and powering OpenAI’s first push into hardware
AIQualcomm
Qualcomm’s CEO is working with ‘pretty much all’ major AI players on top-secret devices—and powering OpenAI’s first push into hardware
By Eva RoytburgMay 9, 2026
23 hours ago
reed
CommentaryRetirement
Tim Cook and Reed Hastings just showed every CEO how to leave gracefully
By Paul HardartMay 9, 2026
1 day ago
Companies are abandoning ‘peanut butter’ raises as pay-for-performance takes over the workplace in the AI era
Future of WorkTech
Companies are abandoning ‘peanut butter’ raises as pay-for-performance takes over the workplace in the AI era
By Marco Quiroz-GutierrezMay 9, 2026
1 day ago

Most Popular

'Employers are increasingly turning to degree and GPA' in hiring: Recruiters retreat from ‘talent is everywhere,’ double down on top colleges
Future of Work
'Employers are increasingly turning to degree and GPA' in hiring: Recruiters retreat from ‘talent is everywhere,’ double down on top colleges
By Jake AngeloMay 9, 2026
20 hours ago
Ted Cruz says the quiet part out loud: Trump accounts are Social Security personal accounts as GOP senator reveals 'dirty little secret'
Politics
Ted Cruz says the quiet part out loud: Trump accounts are Social Security personal accounts as GOP senator reveals 'dirty little secret'
By Jason MaMay 9, 2026
16 hours ago
You're probably safe from the Hantavirus outbreak, but here's what you absolutely must not do, experts say
Politics
You're probably safe from the Hantavirus outbreak, but here's what you absolutely must not do, experts say
By Catherina GioinoMay 8, 2026
2 days ago
Red flag test: former CEO explains why he rejects job candidates who say they can start right away
Success
Red flag test: former CEO explains why he rejects job candidates who say they can start right away
By Orianna Rosa RoyleMay 9, 2026
21 hours ago
Companies are abandoning 'peanut butter' raises as pay-for-performance takes over the workplace in the AI era
Future of Work
Companies are abandoning 'peanut butter' raises as pay-for-performance takes over the workplace in the AI era
By Marco Quiroz-GutierrezMay 9, 2026
1 day ago
A Michigan farm town voted down plans for a giant OpenAI-Oracle data center. Weeks later, construction began
Magazine
A Michigan farm town voted down plans for a giant OpenAI-Oracle data center. Weeks later, construction began
By Sharon GoldmanMay 6, 2026
4 days ago

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.