The basic approach: deactivate, then reinstall

Moving Microsoft Office to a new computer means removing it from your old machine and installing it on your new one. Office is tied to your Microsoft account, not to the computer itself, so the process is straightforward: sign out on the old computer, then sign in on the new one and install fresh.

You do not need to buy Office again. A single Microsoft account can run Office on one computer at a time (for most home versions). The key is deactivating it properly on the old machine first, so Microsoft's system knows you are no longer using it there.

The entire process takes about 20 to 30 minutes, most of which is read and installation time. You will need your Microsoft account password and an internet connection on both computers.

Key Takeaways

  • Office is tied to your Microsoft account, not your computer, so you move it by signing out on the old machine and signing in on the new one.
  • You must deactivate Office on your old computer before installing it on the new one, or you will not be able to use it on the new machine.
  • The installation file comes directly from Microsoft's website using your account login — you do not need a product key or disc.
  • If you cannot access your old computer, you can deactivate Office remotely through your Microsoft account settings online.
  • The whole process is free if you already own Office; you are not buying a new copy.

Sign out of Office on your old computer

Open any Office program on your old computer — Word, Excel, or Outlook all work the same way. Click your name or profile picture in the top right corner of the window. A menu will appear with your account information.

Look for a button or link that says "Sign out" or "Disconnect". Click it. Office will ask you to confirm; click "Yes" or "Sign out" again. The program will close and you will be back at the desktop.

Repeat this for each Office program you use, though signing out of one usually signs you out of all of them. After you have signed out, you can shut down the old computer or set it aside.

read Office on your new computer

On your new computer, open a web browser and go to office.com. Click "Sign in" in the top right corner and enter your Microsoft account email and password — the same account you used on your old computer.

Once you are signed in, look for a button or link that says "Install Office" or "Install apps". Click it. Your browser will read a small installer file, usually called "OfficeSetup.exe" or similar. When the read finishes, click the file to run it.

The installer will launch and begin downloading the full Office suite. This can take 10 to 15 minutes depending on your internet speed. Do not close the installer window or turn off your computer during this time.

Complete the installation and sign in

Once the read finishes, the installer will automatically begin installing Office on your new computer. This usually takes another 5 to 10 minutes. You will see a progress bar and a message saying "Installing" or "Setting up".

When installation is complete, you will see a message saying "You are all set" or "Installation complete". Click "Close" or "Done". Office is now installed on your new computer, but you still need to sign in to set up it.

Open any Office program — Word, Excel, or Outlook. You will see a sign-in screen. Enter your Microsoft account email and password again. Office will verify your account, and within a few seconds you will see the message "Your product is ready to use" or similar. You are done.

What to do if you cannot access your old computer

If your old computer is broken, lost, or you no longer have access to it, you can still move Office. Go to account.microsoft.com on any computer and sign in with your Microsoft account. Click "Your devices" or "Devices" in the left menu.

You will see a list of computers where Office is currently active. Find your old computer in the list and click "Remove" or "Deactivate". Microsoft will when ready deactivate Office on that machine, freeing up your license to use on your new computer.

Then follow the normal installation steps above on your new computer. The deactivation is when ready, so you can install on the new machine right away.

Troubleshooting: Office says it is already in use

If you try to sign in on your new computer and see a message like "This product is already in use on another device" or "You have reached the maximum number of installations", Office is still active on your old machine. Go back and sign out properly, or use the remote deactivation method above.

If you have already signed out on the old computer but still see this message, wait 15 to 30 minutes. Microsoft's system sometimes takes time to register the sign-out. Then try signing in again on your new computer.

If the message persists after 30 minutes, go to account.microsoft.com, find your old computer in the devices list, and click "Remove". This forces the deactivation when ready without waiting for the system to catch up.

Moving Office if you have a Microsoft 365 subscription

If you pay for Office through a Microsoft 365 subscription (monthly or yearly), the process is identical. You sign out on the old computer, then sign in on the new one. Your subscription follows your account, not the computer, so you do not need to do anything else.

Microsoft 365 lets you install Office on up to five computers at the same time, though you can only use it actively on one at a time. If you reach five computers, you can remove an old one from your account at account.microsoft.com under "Your devices" to make room for a new one.

Frequently Asked Questions

Do I need to buy Office again for my new computer?

No. If you own Office outright (a one-time purchase) or have a Microsoft 365 subscription, you move it to your new computer for free. You are not buying a new copy — you are just moving your existing license to a different machine.

What if I want to keep Office on both my old and new computer?

If you have a Microsoft 365 subscription, you can install Office on both computers at the same time. If you own Office outright (a one-time purchase), you can only use it on one computer at a time. To use it on both, you would need to purchase a second copy.

Can I move Office if I forgot my Microsoft account password?

Yes. Go to account.microsoft.com and click "Can't access your account?" to reset your password. Once you have reset it, you can sign in on your new computer and install Office normally. You will need access to the email address or phone number tied to your account.

Does my old computer need to be on when I install Office on the new one?

No. As long as you have signed out of Office on the old computer (or deactivated it remotely through your Microsoft account), your new computer does not need the old one to be running. The two computers do not communicate with each other.

What happens to my documents when I move Office?

Your documents stay where they are. Moving Office only moves the program itself. If your documents are stored in OneDrive or another cloud service, they will be there when you sign in on your new computer. If they are stored on your old computer's hard drive, you will need to copy them separately to your new computer or to the cloud.