For Quick access toolbar customizations, you can export/import a .exportUI file using the steps below:
To export a file:
1. Open Outlook
2. File tab > Options > choose Customize Quick Access Toolbar
3. Bottom right corner next to “Customizations:” choose Import/Export button
4. Choose Export all customizations > click Save to save the file
To import that file on another machine:
1. Open Outlook
2. File tab > Options > choose Customize Quick Access Toolbar
3. Bottom right corner next to “Customizations:” choose Import/Export button
4. Choose Import Customization file > find the file & click Open