OK, here are a few details.  Both of these issues have shown up since 
5/12 (the first time someone emailed me about this - I don't know if 
they lived with it for a while first).

Several clients get this message when trying to send a second email from 
Pdox RT: "MAPI: The operation was not supported by the underlying 
messaging system".

One client gets this message when trying to send the second email: “PFW 
– Runtime Destop has stopped working correctly. Windows will close the 
program and notify you – if a solution is available.”

I haven't had a chance to look at the Event Logs on these computers.

Thanks,
Jim Moseley

On 5/23/2017 5:47 PM, Jim Moseley wrote:
> Greetings,
>
> I'm still trying to gather all the details, but I've had 3 different
> clients in the last week tell me that my Pdox Runtime app is crashing
> the second time they try to send an email with Outlook.  This has been
> working fine for years, so I think MS put out an update that kills the
> MAILTO: protocol or MAPI interface.
>
> Has anyone else run into this issue?  Any ideas on how to fix it?
>
> TIA,
> Jim Moseley