If you have the “New Outlook” from the Store, the library . You must install the classic version.

To avoid "Missing Library" errors when sharing files with users who have different Office versions, you can use Late Binding . This method does not require a checked reference and works by creating the Outlook object at runtime:

The Complete Guide to the Microsoft Outlook 16.0 Object Library DLL

If you already have , Outlook 2019 , or Microsoft 365 installed, the file is already on your computer. You can find it at one of these common paths:

To help find the best fix for your specific setup, please let me know:

This approach does require any specific Outlook version reference. Developers widely recommend this for distributing databases or workbooks to mixed environments.