This post on discount Microsoft software is brought to you by Keysbuff.
In a July Flash Sale, software activation keys provider Keysbuff.com offers great deals on Microsoft products. Cult of Mac readers can hit the links below and save big on Windows 10 — and uncover significant savings on lots of other Microsoft software, too.
If bargains like that sound good, just use promo code COM at Keysbuff.com. That will save you an extra 25% off the site’s already-low prices on keys for Windows 10 Pro Global, Microsoft Office 2021 Pro and other software.
July Flash Sale: Get Windows 10 for $13, Office for $28
Microsoft Windows
- Windows 10 Pro Global Permanent Activation: $15.51 with 25% discount code COM
- Windows 11 Pro Global Permanent Activation: $22.40 with 25% discount code COM
- Windows 10 Home Global Permanent Activation: $13.98 with 25% discount code COM
- Windows 10 Pro Global Permanent Activation for two PCs: $27.35 ($13.68 per PC) with 25% discount code COM
Microsoft Office
- Office 2016 Pro Plus Global Permanent Activation: $28.68 with 25% discount code COM
- Office 2019 Pro Plus Global Permanent Activation: $46.54 with 25% discount code COM
- Office 2021 Pro Plus Global Permanent Activation: $47.02 with 25% discount code COM
- Office Home & Business 2019 Global Permanent Activation: $40.40 with 25% discount code COM
- Office Home & Business 2019 for Mac Global Permanent Activation: $79.61 with 25% discount code COM
Windows + Office bundle
- Windows 10 Pro + Office 2016 Pro Plus Global: $36.68 with 25% discount code COM
- Windows 10 Pro + Office 2019 Pro Plus Global: $55.48 with 25% discount code COM
- Windows 10 Home + Office 2016 Pro Plus Global: $31.60 with 25% discount code COM
- Windows 10 Home + Office 2019 Pro Plus Global: $44.41 with 25% discount code COM
Flash sale on Microsoft software: Act fast!

Screenshot: Keysbuff
Don’t procrastinate if you’d like to take advantage of Keysbuff’s special prices — act fast. These deals — in some cases, as much as 91% off the full price — are limited-time offers and won’t last long. And supplies of these software activation keys are limited, too.
Also note that the keys sold by Keysbuff are activated on the software downloaded from the official software provider website or activated directly on the official website.
How to purchase keys and activate new software

Photo: Keysbuff
Keysbuff’s purchase and activation process is easy to follow. On the software activation key purchase page for the product you want, just click the Buy Now button. Then simply sign up quickly for your free Keysbuff account (or log in if you’re a repeat customer). After you complete your purchase, you will receive your software activation link via email.

Photo: Keysbuff
After you follow the link and receive an OEM product key at the email address you entered during registration, go to Windows 10 Settings. Just click Start > Settings > System > About the program > Change product key, and then enter your product key.

Photo: Keysbuff
After you activate the OEM key, you should see the following message on the activation page: “Windows is activated with a digital license linked to your Microsoft account.”
Installing and activating new software via Microsoft is also a straightforward process. For example, let’s say you want to activate a Microsoft Office package. Just follow these steps:
- Go to the official Microsoft page for the Office software.
- Enter your Microsoft credentials (or create a profile if you do not already have a Microsoft account).
- Enter the purchased product key in the appropriate field (from the Keysbuff email you received after your purchase).
- After selecting your language and region, click Next to complete the activation.
- Now you can install Microsoft Office on your PC.

Screenshot: Keysbuff
Purchase Windows 10 to score a free upgrade to Windows 11
Keysbuff offers amazing software at an affordable price. So, let’s say you’re thinking of building a custom PC. You can buy a Windows 10 software activation key at Keysbuff.com now and get a free upgrade to Windows 11. Then your new machine will zip along with the latest Microsoft operating system and all its improvements.
Once you have Windows 10 turned on, you can proceed to upgrade to Windows 11 for free. To do this, you must update your operating system from Windows Update (click on Start > Settings > Update and security > Windows Update). Install all the updates that Windows offers until you see the option to update to Windows 11.
If you encounter any problems before or after purchase, just contact Keysbuff’s customer service department via email at [email protected].
More about Keysbuff
Keysbuff offers a range of software activation keys for productivity software. It also sells games for an array of platforms, including Steam, Origin, Ubisoft Connect and PlayStation. Plus, the company sells network cards, gift cards, PC games, expansion packs and, of course, many different software activation keys.
Sponsored by Mediamz.