Hotmail
An email service mentioned as an early example of product-led growth through inherent network effects (links in email signatures).
Common Themes
Videos Mentioning Hotmail

Growth with Alex Schultz (How to Start a Startup 2014: Lecture 6)
Y Combinator
A canonical example of viral marketing, which added a 'Sent from Hotmail' signature to emails, leading to high frequency and conversion rates.

E111: Microsoft to invest $10B in OpenAI, generative AI hype, America's over-classification problem
All-In Podcast
Microsoft's email service mentioned as a source of reinforcement learning data for Microsoft.

Steve Jurvetson Interview | The Tim Ferriss Show (Podcast)
Tim Ferriss
An early web-based email service in which Steve Jurvetson was an early investor. It was initially turned down by 21 VCs.

He Built a $1M Business in 12 Months - Every Step Explained (Case Study)
Ali Abdaal
An email service mentioned as an early example of product-led growth through inherent network effects (links in email signatures).

Theranos – Silicon Valley’s Greatest Disaster
ColdFusion

Shay Carl Interview (Full Episode) | The Tim Ferriss Show (Podcast)
Tim Ferriss
Shay Carl's first email account, 'shaycarlhotmail.com', which later inspired his YouTube channel name.