You generally cannot download the as a standalone DLL or library file. This library is part of the Outlook installation itself and is typically provided by a file named MSOUTL.OLB .
A common mistake developers make is searching for a standalone .dll or .tlb file to download online. microsoft outlook 16.0 object library dll download
If you see "MISSING: Microsoft Outlook 16.0 Object Library," it often means the project was created on a newer version of Office than what is currently installed. Uncheck the missing item and find the version available on your machine. Microsoft Outlook 16
Follow these steps to restore the reference in your VBA project without downloading anything from the web: Confirm Outlook is installed and the same Office
Ensure the Outlook feature is not set to “Not Available.” You can run the Office installer, select “Add or Remove Features,” and ensure Outlook is set to “Run from My Computer.”