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Microsoft's Clippy visits 'The Tonight Show' to plug Windows 10

Microsoft brought back Clippy to help plug the new Windows 10 operating system on "The Tonight Show," but everyone's favorite mascot is none-too-pleased to learn that Jimmy Fallon uses a Mac.

Things get a bit dark after Clippy notices the MacBook on Fallon's desk. Video screenshot by Anthony Domanico/CNET

Microsoft released the hotly-anticipated Windows 10 operating system on Wednesday, and amid the strong PR push to encourage users to adopt the new operating system, the company brought out a trusty mascot from yesteryear.

Clippy, the lovable but annoying mascot from the early days of Microsoft Office, visited comedian Jimmy Fallon on "The Tonight Show" on Thursday to promote Windows 10. After Fallon said how much he loved Windows, Clippy noticed an Apple logo on Fallon's computer that caused Clippy to fly a bit off the handle. "It sounds like somebody's being a f***ing liar," Clippy said before he reached down to pick up a virtual baseball bat he intended to use to teach Fallon a lesson.

See how the rest of their interaction played out by watching the clip above. If you're interested in Windows 10, be sure to check out our review of the operating system , and if you're ready to bite the bullet, explore our handy guide that will walk you through the upgrade process.