Find your or Microsoft 365 installation in the list. Click Change at the top of the window.
This article provides a comprehensive guide on what this library is, why you need it, and how to properly acquire or fix it without risking malware from shady "DLL download" sites. What is the Microsoft Outlook 16.0 Object Library?
Open your Office application and press ALT + F11 to open the VBA Editor. Click in the top menu and select References . microsoft outlook 16.0 object library dll download
If your Office was installed from the Microsoft Store, MSOUTL.OLB might be locked inside the C:\Program Files\WindowsApps folder, which by default is inaccessible even to administrators. This is a known issue and it is not recommended to forcibly take ownership of that folder. Instead, try the following alternatives: use late binding (see below), or re‑install Office using the “click‑to‑run” installer from Microsoft’s website, which places the files in the standard Program Files location.
Check and click OK. Alternative: Install the official Microsoft Office Interop NuGet package via the NuGet Package Manager by searching for Microsoft.Office.Interop.Outlook . The Ultimate Fix: Switch to Late Binding Find your or Microsoft 365 installation in the list
The "16.0" version corresponds to modern versions of Desktop Outlook. Installing any of the following suites will automatically place the required library file on your system: Microsoft 365 (Desktop Apps) Microsoft Office 2021 Microsoft Office 2019 Microsoft Office 2016 2. Locate the File on Your Disk
| # | Feature | Description | |---|---------|-------------| | 1 | | Scans existing Office installations to locate msoutl.olb and its dependencies (e.g., outlvba.dll , mapi32.dll ). | | 2 | Redistributable Type Library Pack | Provides a legal, Microsoft-approved developer-only download of just the type library (requires acceptance of Office Redistributable license). | | 3 | Registration Helper | Automatically registers the .olb on the build machine using regtlibv12 (or modern System.Runtime.InteropServices ). | | 4 | NuGet / NPM Package | Wraps the type library into a package that adds COM reference to your project without manual browsing. | | 5 | Version Guard | Detects if Outlook 16.0 is actually installed at runtime and warns if not (since DLL alone cannot send/receive emails). | What is the Microsoft Outlook 16
What are you seeing on your screen? Share public link
[Install] [Cancel]
Download Microsoft Outlook 16.0 Object Library DLL