

You can copy and paste the above location in the Address Bar of File Explorer to open it or configure Windows to show hidden files and folders Control Panel-> Folder Options-> tab View Overview of the *.officeUI and *officeSL files for Outlook Note: The mentioned folder location is hidden by default.

Any command that you have placed in the Ribbon or QAT which isn’t available on the other computer (such as a function of an add-in or custom VBA code) will be removed automatically. You should be able to migrate these files between computers by simply copying the files from one computer to the other while Outlook is closed. The officeUI-files are used for storing the customizations of the Classic Ribbon and the officeSL-files are used for storing the customizations of the Single Line Ribbon of Office 365.
