The server likely does not have Microsoft Outlook installed. The Outlook Object Library requires Outlook to be installed (and often a mailbox configured). On servers, prefer using Exchange Web Services (EWS) or Graph API instead of the Outlook COM object.
The library file is named and is typically found in your Office installation folder. Common File Paths: C:\Program Files\Microsoft Office\root\Office16\MSOUTL.OLB C:\Program Files (x86)\Microsoft Office\Office16\MSOUTL.OLB Manual Activation in VBA: Open the VBA Editor ( Alt + F11 ). Go to Tools > References . microsoft outlook 16.0 object library dll download
If the reference is missing in your VBA project, you can manually locate it at these common installation paths: Stack Overflow 64-bit Office: C:\Program Files\Microsoft Office\root\Office16\MSOUTL.OLB 32-bit Office: Microsoft Outlook 16