Are Cheap Windows Keys Legit? How To Buy a Genuine Key Safely
Why cheap Windows keys are cheap, where gray-market keys come from, and an eight-point checklist for telling a legitimate reseller from a risky one.
Microsoft Product Key and Activation Guides
Plain-English guides from the OfficeGSM team on Windows product keys, Microsoft Office activation, edition comparisons and Windows Server licensing, so you buy the right license once and get it working in minutes.
Compare Windows Server Versions and Editions: 2016 to 2025
Windows Server 2016, 2019, 2022 and 2025 compared with Essentials, Standard and Datacenter editions, support end dates and upgrade paths.
Windows OEM vs Retail License: Which Key Should You Buy?
OEM Windows licenses stay with the first PC; retail licenses move with you. Here is how they differ, how to check yours with slmgr, and which to buy.
What Happens if You Don’t Activate Windows 10 or 11?
What happens if you don't activate Windows: the watermark, greyed out personalization settings, what still works, and how to fix it.
Windows Server Standard vs Datacenter: Which Edition Do You Need?
Standard allows two VMs per license, Datacenter unlimited. We compare features, per-core licensing, CALs and how to switch editions with DISM.
How To Activate Windows 11 With a Product Key
How to activate Windows 11 in Settings or by phone with slui 4, check activation status, and fix errors like 0xC004F050 on Home and Pro.
What Is a Windows Product Key and How Does Activation Work?
A plain explanation of the 25-character Windows product key, how activation works, and how a product key differs from a digital license.
Microsoft Office for Mac: Versions, Prices and How to Buy
Every current version of Microsoft Office for Mac compared, with prices, Apple silicon support, and how to redeem a one-time key at setup.office.com.