How to Find and Activate Microsoft Office 2016 or 365 on your new Dell system
Activation Process.
When activating your Office product in Windows 8.1/10 you will need to complete the following steps. Please ensure that your Windows activation has been completed. If Windows is not activated please allow the Microsoft Update process to complete and then review your Windows activation again. Once Windows is activated you may start your Office Activation.
Microsoft article: Activate an Office purchase or free offer on a new PC 
NOTE: An active Internet connection is required to activate your Office 2016 or 365 product.
When you begin, you will see the Office factory pre-install version reflected as Microsoft Office Home and Student 2016 or Microsoft Office 365, which will change (i.e. upgrade or downgrade as applicable) on its own to your Office product version purchase once activation processing is completed.
Once you initiate the activation process, please wait until all of the Office upgrades, downgrades, and updates have been completed on Microsoft's backend. This activation processing may take longer than just a few minutes, dependent upon the strength of your Internet connection. Please close all open Office Apps (Word, PowerPoint, Excel, etc.) - this can speed up upgrade/downgrade/update completion. Please return later to check and verify that you have successfully activated your Office product purchase.
When you begin, you will see the Office factory pre-install version reflected as Microsoft Office Home and Student 2016 or Microsoft Office 365, which will change (i.e. upgrade or downgrade as applicable) on its own to your Office product version purchase once activation processing is completed.
Once you initiate the activation process, please wait until all of the Office upgrades, downgrades, and updates have been completed on Microsoft's backend. This activation processing may take longer than just a few minutes, dependent upon the strength of your Internet connection. Please close all open Office Apps (Word, PowerPoint, Excel, etc.) - this can speed up upgrade/downgrade/update completion. Please return later to check and verify that you have successfully activated your Office product purchase.
- Click on an Office application icon (In the example the Microsoft Word Icon). (See Figure 1.)
Figure 1. - Microsoft Word Icon on the Start Menu in Windows 8.1 and Windows 10
- Click on an Office application icon (In the example the Microsoft Word Icon). (See Figure 1.)
- As your Office Application opens for the first time, you will be prompted to activate the product.. Click the Activate button to start the activation process. (See Figure 2.)
Figure 2. - Let's get started with the Office Activation process.- If you are not currently signed into your Microsoft Account (MSA) you will see this screen: (See Figure 3)
Figure 3. - If Windows on the system is not signed in using a Microsoft Account (MSA), you are prompted to sign in to your Microsoft Account (MSA)
If you are currently signed into your Microsoft Account (MSA) you will see this screen: (See Figure 4)
Figure 4. - If Windows on the system is signed in to a Microsoft Account (MSA), you are prompted to CONFIRM your Microsoft Account (MSA)
- Next you will be prompted to select your Country and Language preferences. (See Figure 5.)
Figure 5. - Selection of Country and Language during Office activation
- Next you will be prompted to select your Country and Language preferences. (See Figure 5.)
- If you have multiple Office product keys tied to your MSA, you will see them listed. Select the one on top to activate Office. (See Figure 6.)
Figure 6. - Selecting the top option to activate Office (If you have multiple product keys associated with your MSA)
- If you have multiple Office product keys tied to your MSA, you will see them listed. Select the one on top to activate Office. (See Figure 6.)
- Accept Office Updates (See Figure 7.)
Figure 7. - First things first, Accepting the Office updates.
- Accept Office Updates (See Figure 7.)
- You are all set and can now start using your Office app. (See Figure 8.)
Figure 8. - Office 2016 or 365 setup is now complete.
- You are all set and can now start using your Office app. (See Figure 8.)
- Now we need to make sure this product was successfully activated. To do this, go to File > Account in your Word document. DO NOT CLICK Activate Product at this point. Instead click the Update Options next to Office Updates and select "Update Now" (See Figure 9.)
Figure 9. - Check Office updates.
- Now we need to make sure this product was successfully activated. To do this, go to File > Account in your Word document. DO NOT CLICK Activate Product at this point. Instead click the Update Options next to Office Updates and select "Update Now" (See Figure 9.)
- Let Office run through the updates and once complete (Time for this varies based on the speed of your internet connection and the version of Office purchased.), check back to the same location to ensure the product is successfully activated like the example below (See Figure 10.)
Figure 10. - Office Activated.