The is not available as a standalone DLL download ; it is a component of the Microsoft Office installation. This library is typically stored in a file named MSOUTL.OLB , which is automatically installed when you install the "Classic" Outlook desktop application. Locating the Library File
For modern development outside of VBA, you can find the Microsoft Office Interop NuGet package on NuGet. microsoft outlook 16.0 object library dll download
If the reference is "missing," it is usually because the file path has changed or the Office installation is corrupted. You can manually find the file in the following default locations: Microsoft Outlook 16
C:\Program Files (x86)\Microsoft Office\root\Office16\MSOUTL.OLB Stack Overflow To manually add the reference in a VBA project: Open the VBA Editor (Press References Scroll to find Microsoft Outlook 16.0 Object Library If it is missing from the list, click and navigate to the file paths mentioned above. Stack Overflow Risks of External Downloads C:\Program Files (x86)\Microsoft Office\root\Office16\MSOUTL
The is not a file you should ever download in isolation. It is a trusted, digitally signed component of Microsoft Office. Your time is better spent repairing your Office installation, ensuring proper licensing, and using the correct reference paths in your development environment.
C:\Program Files\Microsoft Office\root\Office16C:\Program Files (x86)\Microsoft Office\root\Office16