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Download and install Office 365 on a Mac

Note: If you have a previous version of Office installed, it needs to be uninstalled before downloading and installing Office 365.

  • Sign in to Office 365 ( with your CatNet credentials. If you are unable to, please contact the ITS Support Office for assistance ( or 503-883-2553).
  • From the home page, click on the link on the upper right to install the latest version of Office. Note: you can also just use the online apps instead of downloading.

Install Office Button

  • Once the download has completed, open Finder, go to Downloads, and double-click the Microsoft Office Installer.pkg.


  • On the first installation screen, select Continue to begin the installation process.

Mac Install

  • Review the software license agreement, and then click Continue.
  • Select Agree to agree to the terms of the software license agreement.
  • Review the disk space requirements, and then click Install.
  • Enter your CatNet credentials, if prompted, and then click Install Software. (This should be the password that you use to log in to your Mac.)
Mac Keychain
  • The software begins to install. Click Close when the installation is finished.
Mac Install Successful

Launch an Office for Mac app and start the activation process

  • Click on Finder -> Go -> Applications. Locate an Office 365 application (e.g., Word, Excel) and click on it. 
  • The What's New window opens automatically when you launch Word (for example). Click Get Started to start activating.