How to Deactivate Office 365 on an Old Computer

When you subscribe to Office 365 you’re allowed to install the Office desktop applications (Word, Excel, PowerPoint, etc.) on a certain number of PCs and Macs depending on your subscription level. When you buy a new PC or Mac, or otherwise change computers, you may want to deactivate your Office 365 subscription on your previous system, both to prevent that computer’s new owner from accessing your account as well as to ensure that you don’t hit your Office install limit.
Thankfully, the process of deactivating an Office 365 install is fairly simple, and you don’t even need to have access to the computer you’re trying to deactivate, which is great in the event that you forgot to deactivate it before selling it or giving it away. Here’s how it works.

How to Deactivate Office 365 on an Old Computer

Deactivate Office 365 Install

To get started, log into your Office 365 account at Microsoft’s website.
Once you’re logged in, look for the button labeled Install Office and click it. (Yeah, yeah, I know that’s not very intuitive.)
install office 365
On the next page, scroll down a bit and you’ll see a section labeled Install Information. This lists all of the devices on which your Office 365 account is currently activated (i.e., the PCs, Macs, and tablets on which you downloaded and installed the Office applications as part of your subscription). Find the computer you’d like to deactivate and click its corresponding Deactivate Install link.
deactivate office 365
Microsoft will ask you to confirm the decision, and let you know that the Office applications themselves will still be present on the device (unless you manually uninstall them), but they’ll be limited to viewing and printing documents unless they’re activated with another Office 365 account or valid Office product key.
deactivate office 365 confirmation
Once you confirm the deactivation, you’ll be returned to your list of Office 365 installs. The device you deactivated should now be missing from the list, which frees you up to activate your subscription on a new PC, Mac or tablet.
office 365 deactivated
Speaking of activating Office 365, if you need to install the Office applications on a new PC or Mac, you can download the Office installer from the same page on which you deactivated your old device. If you’re working with a PC or Mac that already has Office installed, you can simply sign in to activate the apps under your Office 365 subscription and restore full functionality.
If you’re confused about what version of Office 365 you have and how many times you can use your account to log in on a device, check out Microsoft’s purchasing page; if your account is listed on the screens shown in my above screenshots as an “Office 365 Personal” one, you’re only allowed to use it on one Mac or PC, but if it’s the more expensive “Office 365 Home,” you can install it on up to five machines. I find that naming convention to be…uh…rather unclear. Much as I like Office, the different versions are kind of confusing, but at least there’s an easy way to activate the programs on a new computer!

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