Vernon D. Cole wrote:
Most likely, you are running a 64  bit version of Python.
Due to Windows restrictions, only 32 bit programs can talk to each other.

That comment demands clarification, because as stated it is quite misleading.

The issue here is that a 32-bit application can only load 32-bit DLLs.  Outlook 2016 is a 32-bit application, so when it as a COM client tries to load an in-process COM server (that is, his add-in), the COM server DLL must also be 32-bit.

There are many, many ways that 32-bit and 64-bit programs can talk to each other.  This is a very specific instance.

--
Tim Roberts, t...@probo.com
Providenza & Boekelheide, Inc.

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