Skype: from Kazaa to Microsoft's $8.5 billion acquisition

Executive overview

Skype's founders built two viral peer-to-peer products — Kazaa and Skype — before either was fully theirs to own. The recurring mistake: selling the company while retaining the underlying technology, then licensing it back, creating legal leverage that haunted every subsequent transaction.

The core insight: retaining IP while selling the product created a recurring trap — but also gave the founders leverage in every deal.

Skype grew to 700 million users with near-zero customer acquisition costs by exploiting P2P architecture to avoid server and marketing spend entirely. eBay bought it for the wrong reasons, couldn't integrate it, and eventually spun it out. Private equity cleaned it up in under two years. Microsoft paid 32x operating profit to own it outright.

Founders and origins

• Niklas Zennström and Janus Friis met at Swedish telecom Teletoo in 1999
• Hired three Estonian developers — who learned PHP in a weekend — to build a web portal
• Left to found Kazaa, a Napster competitor for all file types, which became the most popular application on the internet
• Sold Kazaa on paper to Australian businessmen but retained the core P2P technology
• Realised the same P2P architecture could route voice packets cheaply across the internet

Building Skype (2002–2003)

• Named from "Sky Peer-to-Peer" → "Skyper" → "Skype" (skyper.com unavailable)
• Design principle: simple enough for a soccer mom with no knowledge of firewalls or IP addresses
• Launched August 2003: 10,000 downloads on day one, 1 million users in month one, ~20 million in year one
• No server costs (P2P model), no marketing spend — cost to acquire a user was $0.001 vs. Vonage's $400
• Raised $18M from Index, Bessemer, and DFJ after launch on the back of organic growth

eBay acquisition (2005) and the IP trap

• eBay acquired Skype for $2.6B in September 2005; rationale was enabling buyers and sellers to call each other
• Zennström and Friis retained the core P2P technology in a separate company, Joltid, and licensed it to eBay
• Severe culture clash: Estonian startup energy vs. San Jose corporate structure
• By 2009, Skype had 500M+ users and $185M revenue in a single quarter — fastest-growing eBay division, no synergies
• eBay wrote down Skype's value internally in 2007

Private equity spin-out (2009–2010)

• Silver Lake, Andreessen Horowitz, and others bought 56% of Skype; eBay retained 30%
• Zennström and Friis sued to block use of the Joltid technology — a real risk Skype could be shut down
• Settlement: Joltid received 10% equity + $85M cash; founders reinvested $80M for ~4% more; Skype finally owned its own technology
• Silver Lake installed Tony Bates (ex-Cisco) as CEO; pushed Skype hard onto iOS and Android
• Skype filed an S1 to go public — the dual-track IPO process drew Microsoft out of the woodwork

Microsoft acquisition (2011)

• Microsoft acquired Skype for $8.5B in May 2011 — its largest acquisition to date
• At acquisition: 700M users, $860M revenue, $264M operating profit for full-year 2010; price = 32x operating profit
• Acquisition led through the Office division by Kurt Delbeni; primarily an enterprise play
• Integration absorbed MSN Messenger and rebranded Lync as Skype for Business
• Tony Bates was a finalist to succeed Steve Ballmer as CEO; left Microsoft after the succession went to Satya Nadella

Why the deal worked despite the price

• Microsoft held large cash reserves overseas; Skype was a Luxembourg corporation — a tax-efficient use of foreign capital
• Google and Facebook were rumoured buyers at roughly half the price; competitive pressure justified the premium
• eBay ultimately recovered close to its original $2.6B purchase price just from its retained 30% stake at the Microsoft exit
• Value created between the PE spin-out ($2.75B, Sept 2009) and Microsoft acquisition ($8.5B, May 2011): ~$6B in under two years

Post-acquisition and tech themes

• Skype's unit economics were exceptional: pure organic growth, zero server costs, zero CAC — a rare "10x revenue" business per Bill Gurley's framework
• Microsoft struggled to present a coherent product story: Skype for Business, Skype for Consumers, and derivative products created confusion vs. Slack's single front door
• The absence of empowered product leaders inside Microsoft post-acquisition — unlike the Accompli/Outlook integration — limited execution
• The Skype story foreshadowed WhatsApp: same value prop (cheap cross-border communication), text instead of voice, $22B valuation
• Hosts grade the Microsoft acquisition B−: right strategic move, good use of foreign capital, but unrealised potential due to integration execution