How to Reinstall Office 365
on you Mac

Using Office 365 on a Mac combines the extreme usefulness of Microsoft’s exceptional software with the complete intuitive convenience of Mac products. When both are working well, you have the best products available for most work, study, and personal activities. When you need to reinstall Office, however, it can be tricky Fortunately, Microsoft provides a relatively simple (and free) way to reinstall Office 365. Should you need to reinstall Office 365 for Mac, use the guide below to reinstall Microsoft Office 365 on your Mac quickly without any hassle. If you have purchased from SoftwareKeep USA, we are always available with highly-trained staff to assist you.

Before you Begin

Find out if your version of Office is Home or Business

There are many versions of Office 365, and the install instructions are different depending on which of two categories your version fits into: Home or Business.

Home versions include:

  • Office 365 Home
  • Office 365 Personal
  • Office 365 University
  • Office 2016 Home & Student
  • Office 2016 Home & Business
  • Office 2016 Professional
  • Office 2016 Professional Plus

Business versions include:

  • Office 365 Business
  • Office 365 Business Premium
  • Office 365 Education E5
  • Office 365 ProPlus
  • Office 365 Enterprise E3
  • Office 365 Enterprise E4
  • Office 365 Enterprise E5
  • Office 365 Nonprofit Business Premium
  • Office 365 Nonprofit E3
  • Office 365 Nonprofit E5
  • Office 365 U.S. Government Community G3
  • Office 365 U.S. Government Community G5
  • Project Online Professional
  • Project Online Premium
  • Visio Pro for Office 365

Once you have determined which version of Office 365 you are reinstalling, proceed with these steps:

Find out if you have a license or a product key

Find your product key. The product key is a 16-digit code you received with your original Office 365 purchase. When you downloaded Office 365, you should have received a confirmation email. The product key is there. Keep the number for your reinstallation.

Reinstalling Office 365 Home

Login icon

Step #1:

If you didn’t register your product key when you first installed Office 365, do so now. Go to and log in using any Microsoft account (Hotmail, Outlook, X Box Live, etc.). If you don’t have an account, create one now. When prompted, insert your 16-digit product key.

Step #2:

Go to the above and log in if you aren’t already logged in. Make sure you use the account on which your Office 365 is registered.

Download icon

Step #3:

Look for your subscription for Office 365 and click to install it. Confirm the version you are downloading is correct by clicking Install again.

Step #4:

Open your Finder and go to Downloads. When you see a file called Microsoft_Office_2016_Installer.pkg, or something similar, click on it. This will open an installation window.

Next icon

Step #5: Click through the prompts

You will see a number of prompts come up. On the first, the Introduction, click continue. You will be asked to review the software license agreement. Once you have done so, click Continue. At that point, you will be asked if you agree with the terms. Click Agree. You will be asked to choose how and where to install Office. A default option should be presented. Unless you have specific custom needs, choose the default option and continue. Review disk space requirements and click Install.

Step #6:

You will be prompted to enter your login information, including your password, to ensure you want to install this software on your computer.

Program icon

Step #7:

Installation complete. Close the window and go to Launchpad. Choose choose a program from the Office suite and open it.

Step #8:

Activate your Office. When you open a program you will see a “What’s New” window. Click on Get Started at the bottom to walk through the activation process.

At this point, you can choose the programs you want to pin to your dock for easy access. Open the desired program then go down to the dock where the program icon is. Control-click or right-click on the icon and choose the option Keep in Dock. The icon will remain after you close the program, giving you quick and easy access to it the next time you want to use the program.

Reinstall Office 365 Business

Login icon

Step #1:

Sign in at Go to the website and sign in with the business or school account where your Office 365 is registered.

Step #2:

Under the Office page, find where it says “Install Office 2016.” Click on the Install button to begin the process. Once the file has downloaded, follow steps 4-9 of the Home version above.

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