Option 1 - Manually Recreate the icons
Right-click on a blank area on your desktop and choose New → Shortcut
Paste "C:\Program Files\Microsoft Office\root\Office16\OUTLOOK.EXE" click Next
Name it whatever you want or leave the default name
Click Finish
You can do this for other office applications, just replace Outlook.exe with Winword.exe, Excel.exe, or PowerPoint.exe.
You can also copy these shortcuts in the following folder so the icons appear in your start menu:
C:\ProgramData\Microsoft\Windows\Start Menu\Programs
Option 2 - Extract the following Zip File
We have also created the following file to restore Office icons and others.
Download the Zip and save the icons to your desktop.
This file includes the following shortcuts:
Chrome
Firefox
Creative Cloud
Excel
Microsoft Access
Publisher
Microsoft Teams
OneNote
Outlook
Powerpoint
Visio
Word