If it is missing from the list, click and navigate to the MSOUTL.OLB file at the paths mentioned above. Troubleshooting "Missing" References
If you see an error stating the library is "Missing," it often means the project was created on a computer with a different Office version. microsoft outlook 16.0 object library dll download
To use Outlook 16.0 objects in a project (like an Excel macro), you must enable the reference: If it is missing from the list, click