Mark HachmanSenior Editor, PCWorld

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As PCWorld's senior staff writer, Mark focuses on Microsoft news and chip technology, among other beats. He has formerly written for PCMag, BYTE, Slashdot, eWEEK, and ReadWrite.

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My worst week with Windows 10 Preview: When downloads go very, very wrong

First an upgrade to Windows 10 on a notebook went bad, then Windows 10 Mobile build 10149. When Microsoft's previews glitch, they glitch hard.

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NASA's taking Microsoft's HoloLens to the space station

The NASA Sidekick program will use Microsoft's HoloLens as a tool to allow NASA ground control to peer over the shoulders of NASA engineers.

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Microsoft's Games with Gold finally offering some decent games for the Xbox One

It appears that Microsoft's game library for the Xbox One has now hit critical mass, and Xbox Live Gold members will benefit with two new Games with Gold titles for the Xbox One.

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Microsoft's Sway gains legitimacy with Windows 10 plans, iPad app

Microsoft's lightweight content creation tool will be an integral part of Windows 10 when it launches this summer.

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Why most of us will miss out on Windows Hello, Windows 10's facial recognition feature

The expensive depth cameras needed to make it a reality will appear on high-end PCs, but not across the board.

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The Holy Grail of notebook PCs, external graphics, is coming soon via Oculink

Oculink, designed for external PCI Express graphics on notebooks and PCs, could give laptops the graphics punch they need for gaming after hours.

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Bing Rewards slyly pushes Bing searches on iOS, Android with slick update

Bing Rewards is Microsoft's way of gently pulling iOS and Android users away from their native search engines, with a new look for Bing that complements its paid rewards.

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If you want Windows 10, get a Windows 7/8.1 PC, already

Microsoft says Windows 10 will be free but not for XP and Vista users, even if they've been trying Windows 10 on the Insider program.

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Windows Insiders will need a Microsoft account to get the release version of Windows 10

Those of you who plan to upgrade a Windows 8 or Windows 7 PC won't need an account to upgrade to Windows 10, however.

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Expect Windows 10 Mobile to improve significantly in July, Microsoft exec says

Don't worry, says Microsoft. As Windows 10 nears completion, the company will soon reallocate its development resources to Windows 10 Mobile.

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Microsoft's selfie-obsessed Lumia 735 debuts on Verizon for under $200

We're going to tell you all about the Lumia 735, but first we're going to take a selfie.

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Microsoft reorg solidifies role of Surface, HoloLens and other devices to sell Windows

By uniting its Windows and Devices group under Terry Myerson, Microsoft wants to "drive Windows as a service across devices of all types," per CEO Satya Nadella.

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Intel continues wearables buying spree with smart-goggles maker Recon

Recon will use the funding to nurture a developer base and tap Intel's chipmaking ability.

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Hands-on: Windows 10 Mobile build 10136 shows polished Cortana, new Photo app

The new Windows 10 Mobile Build 10136 contains tons of minor UI improvements, and one much more significant one: Cortana is almost complete.

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Microsoft kills Kinect support in Xbox One's backward-compatibility push

If you were hoping to play an older Kinect game via the Xbox 360 compatibility Microsoft just announced with the Xbox One, you're out of luck.