MAPI Editor Options

I thought it’d be interesting to document the registry values that MAPI Editor uses. Most of them are exposed in the UI through Options/Other. All of these registry keys are stored under the registry key HKEY_CURRENT_USERSoftwareMicrosoftMFCMAPI. If a registry value is not found, the default is assumed. True/false values are stored with the usual convention…


Folders Don’t Do Named Props

A fellow engineer recently asked me how to set custom properties on a folder object in a PST. I reminded him that folders in the PST provider don’t support named properties. He was surprised to hear this. I was surprised to learn that this hadn’t actually been documented before. (If anyone can produce a link…


The Intentional Memory Leak

So – there’s a memory leak in Outlook’s implementation of MAPI. That shouldn’t be too much of a shock. Just about any sizable application is bound to have a leak or two. What’s interesting about this leak is that it is intentional. A little history: We first shipped Simple MAPI back in MS Mail, circa…