A security researcher discovered that the InPrivate browsing mode of Microsoft's new Edge browser is not as private as it seems. Ashish Singh noticed that sites viewed in the InPrivate mode can easily be recovered from a hard drive by examining cache files:
Exploring the WebCache file on a Windows 10 computer, The Verge was able to partially confirm Singh’s results, recovering evidence of a site visited in private mode after the session had been closed. We were not able to locate the Container_n table or recover a complete web history from the Private Session, although it’s likely a trained professional would have more success.
Microsoft confirmed the issue and explained they're committed to resolving it as quickly as possible.