When trying to install a one-time purchase of Office from accounts.microsoft.com, you might see an error message that states "Unsupported operating system"
![Unsupported Operating System error indicates you can't install Office on your current device](https://cxcs.microsoft.net/static/public/office-lifecycle/neutral/93593c7c-8989-4fcb-a8bb-6ae816b851e1/c86728f5398f8ccbb00ddeb4561d41da4ccee5bd.png)
For the best performance, use the latest version of the Windows or Mac operating system for your version of Office as follows:
-
PC: Windows 10, Windows 8.1, Windows 8, Windows 7 Service Pack 1, Windows Server 2016, Windows Server 2012 R2, Windows Server 2012, or Windows Server 2008 R2
-
Mac OS X 10.10
Check the system requirements for the latest info.
Did you buy the right version of Office for your hardware?
If you bought a one-time purchase of Office, such as Office Home & Student, you might have bought the Mac version for your Windows PC, or the Windows version for your Mac.
To check which version you bought, go to Services & subscriptions and look for the following:
This is the Windows version
![How the PC version of Office 2016 appears on Office.com/myaccount](https://cxcs.microsoft.net/static/public/office-lifecycle/neutral/31a82da4-066a-43b7-81d5-74db6280a624/c51e736cdd6fde0d5dcfc4333b307069b1520937.png)
Windows versions of Office might show for PC in the title. If you don't see it, look for For 1 PC in the subtitle
This is the Mac version
![How the Mac version of Office 2016 appears on Office.com/myaccount](https://cxcs.microsoft.net/static/public/office-lifecycle/neutral/1d42d205-1d36-489d-a306-945fb4a93dad/bf680e96838b3d6b946402ec1788f5105c39d084.png)
Mac versions of Office show for Mac in the title and For 1 Mac in the subtitle
If you bought the wrong version of Office for your hardware, contact Microsoft support.
Note: Microsoft 365 can be installed on both Windows PCs and Macs.
Are you installing on a mobile device or Chromebook?
The Office desktop apps are for Windows PC or Macs only. To install Office on a mobile device, such as the iPad Pro or a Chromebook, you can download the Office mobile apps from your device's app store. For help, see Set up Office apps and email on a mobile device.