If you bought Microsoft 365 or Office and now see the words Microsoft365.com/setup on a card or an email, you are in the right place. This page is where your product key meets your Microsoft account. Once the two are linked, you can download and install your apps.
This guide explains how Microsoft365.com/setup works and how to install Office properly, step by step, so you do not get stuck halfway.
Microsoft365.com/setup is the web address you use to redeem a product key and start your Microsoft 365 or Office install. You sign in with your Microsoft account, enter the 25-character key, and the page adds the product to your account. After that, you can download the apps from your account page.
You only redeem a key once. After that, the product belongs to your account, so you can reinstall later without the key.
A Microsoft account (you can create one during setup)
Your 25-character product key, found on a card, a box or in your order email
A stable internet connection
A Windows PC or a Mac that meets the system requirements
Enough storage space for the download
Old or trial Office versions removed, if you have any
Step 1: Open the Setup Page
Type microsoft365.com/setup in your browser’s address bar and press Enter. Type it yourself instead of clicking an unknown link, so you land on the right page.
Step 2: Sign In With Your Microsoft Account
Enter your email and password. If you do not have an account, choose the option to create one and follow the prompts.
Step 3: Enter Your Product Key
Type the 25-character key exactly as printed. Dashes are not needed, and letters are not case sensitive.
Step 4: Choose Your Country and Language
Pick your country or region and your language, then click Next.
Step 5: Confirm and Redeem
Review the details and confirm. Your product is now added to your account.
Step 6: Download and Install Office
Go to your Microsoft account page, find your product and click Install. Open the downloaded file and follow the prompts. Keep the computer on and online until the install finishes.
Step 7: Open an App and Sign In
Open Word, Excel or any other app, sign in with the same Microsoft account and accept the license terms. Your setup is complete.
Why Microsoft365.com/Setup Is Not Working
Common Reasons
The product key was typed with a mistake
The key was already redeemed on another account
You are signed in with a different Microsoft account
The internet connection dropped during the download
An older Office version is blocking the new install
How to Fix It
Re-type the key slowly. Check for look-alike characters such as 0 and O, or 1 and I.
Sign out, then sign in again with the account you want to use.
Try another browser, such as Edge or Chrome.
Turn off a VPN and restart your router.
Uninstall any old Office version, restart the computer and run the install again.
Tips for a Smooth Install
Keep your key somewhere safe until the setup is done.
Use an email you will remember, because you will need it for every reinstall.
Close other programs while the install is running.
Restart the computer after the install finishes.
Install updates when the apps ask for them.
Frequently Asked Questions
What is Microsoft365.com/setup used for?
It is used to redeem a product key and link your Microsoft 365 or Office product to your Microsoft account.
Where do I find my product key?
Look on the card in the box, or in the email sent when you bought the product.
Can I use Microsoft 365.com/setup without a Microsoft account?
No. You need an account, but you can create one on the setup page.
Do I need to enter the key every time I reinstall?
No. Once redeemed, the product stays in your account, and you can install again after signing in.
How many devices can I install it on?
It depends on your plan. Check the plan details in your Microsoft account page.
Final Words
Setting up Office does not need to be hard. Open Microsoft365.com/setup, sign in, enter your key and install the apps from your account page. If something fails, check the key, the account and your internet first. Most setup problems come from those three things.