• 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
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
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
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Tech

Who’s really in control as AI and Big Tech race ahead?
MagazineEurope
Who’s really in control as AI and Big Tech race ahead?
By Francesca CassidyApril 10, 2026
1 hour ago
Photo: Donald Trump
EconomyMarkets
U.S. and Iran begin peace talks as Trump’s White House goes to war against the media, insider traders, and the Pope
By Jim EdwardsApril 10, 2026
2 hours ago
Fortune Brainstorm Tech 2019 in Aspen, Colo. (Photo: Fortune)
NewslettersFortune Tech
Who’s speaking at Fortune Brainstorm Tech 2026
By Andrew NuscaApril 10, 2026
4 hours ago
Schools across America are quietly admitting that screens in classrooms made students worse off and are reversing years of tech-first policies
InnovationEducation
Schools across America are quietly admitting that screens in classrooms made students worse off and are reversing years of tech-first policies
By Marco Quiroz-GutierrezApril 10, 2026
4 hours ago
Dario Amodei
NewslettersTerm Sheet
What Anthropic’s too-dangerous-to-release AI model means for its upcoming IPO
By Beatrice NolanApril 10, 2026
4 hours ago
Even Nvidia’s own research teams can’t get enough GPUs amid the race for AI computing power
NewslettersEye on AI
Even Nvidia’s own research teams can’t get enough GPUs amid the race for AI computing power
By Sharon GoldmanApril 9, 2026
20 hours ago

Most Popular

The U.S. government is spending $88 billion a month in interest on national debt—equal to spending on defense and education combined
Economy
The U.S. government is spending $88 billion a month in interest on national debt—equal to spending on defense and education combined
By Fortune EditorsApril 9, 2026
1 day ago
A Meta employee created a dashboard so coworkers can compete to be the company's No. 1 AI token user—and Zuckerberg doesn't even rank in the top 250
AI
A Meta employee created a dashboard so coworkers can compete to be the company's No. 1 AI token user—and Zuckerberg doesn't even rank in the top 250
By Fortune EditorsApril 9, 2026
1 day ago
Gen Z doesn't want your full-time job. They want several part-time roles, and it's reshaping the entire workforce
Success
Gen Z doesn't want your full-time job. They want several part-time roles, and it's reshaping the entire workforce
By Fortune EditorsApril 9, 2026
1 day ago
White-collar workers are quietly rebelling against AI as 80% outright refuse adoption mandates
AI
White-collar workers are quietly rebelling against AI as 80% outright refuse adoption mandates
By Fortune EditorsApril 9, 2026
1 day ago
'I hate working 5 days': Zoom CEO says traditional work schedules are becoming obsolete—and predicts a 3-day workweek by 2031
Success
'I hate working 5 days': Zoom CEO says traditional work schedules are becoming obsolete—and predicts a 3-day workweek by 2031
By Fortune EditorsApril 9, 2026
21 hours ago
Current price of oil as of April 9, 2026
Personal Finance
Current price of oil as of April 9, 2026
By Fortune EditorsApril 9, 2026
24 hours 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.