Open your Office application (Excel, Access, etc.) and press to open the VBA Editor. Go to Tools > References .
' Requires Tools -> References -> Microsoft Outlook 16.0 Object Library Dim oLookAs As Outlook.Application Dim oMail As Outlook.MailItem Set oLookAs = New Outlook.Application Set oMail = oLookAs.CreateItem(olMailItem) Use code with caution. Example: Late Binding (Safe for All Office Versions)
16.0 (Corresponds to Office 2016, 2019, 2021, and Microsoft 365). microsoft outlook 16.0 object library dll download
If you need a macro to work across multiple Outlook versions (e.g., 2010, 2013, 2016), avoid adding a specific reference and switch to .
A common mistake developers make is searching for a standalone .dll or .tlb file to download online. Open your Office application (Excel, Access, etc
| Error | Likely Cause | Fix | |-------|--------------|-----| | “Cannot find Microsoft Outlook 16.0 Object Library” | Office missing or corrupt | Install/repair Office | | “Class not registered” | Office install issues | Run Regsvr32 on outlvba.dll (found in Office root) | | “Error loading MSOUTL.OLB” | Reference path broken | Remove and re-add the reference |
These alternatives eliminate the need to manage the Outlook Object Library entirely. Example: Late Binding (Safe for All Office Versions) 16
If this were a feature in a development tool (e.g., Visual Studio, an add-in builder, or a package manager), here is how it would work:
Locate your version of or Microsoft 365 in the list. Click Change at the top of the window.
Unlike standard DLLs, this library is compiled as an Object Library file with an .olb extension. It is typically found in one of these system directories:
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