Steven,

Awesome find, as usual.  The only thing I need to add is that you must install
the 32 Bit version of Outlook.  64 Bit dies with similar message.

HTH,
Jim Moseley

"Steven Green" <greens@diamondsg.com> wrote:
>further research on the MS help site.. seems Outlook build 16.0.8067.2115

>fixes it.. why those three have the bad one before it, and nobody else does,

>is a mystery..
>
>https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-msoffice_custom/mapi-error-in-latest-outlook-2016-office365/168ea28a-98b0-4c62-be73-274fb16cca9a
>
>
>--
>
>Steven Green
>Myrtle Beach, South Carolina, USA
>
>http://www.OasisTradingPost.com
>
>Collectibles and Memorabilia
>Vintage Lego Sets and Parts
>- and Paradox support, too
>
>"Steven Green"  wrote in message news:592ed0c1$1@pnews.thedbcommunity.com...
>
>any obvious commonality between the three? it can't be a Win Update, or
it
>would be widespread.. must be a specific other program that only they use,
>or something from their email
>
>--
>
>Steven Green
>Myrtle Beach, South Carolina, USA
>
>http://www.OasisTradingPost.com
>
>Collectibles and Memorabilia
>Vintage Lego Sets and Parts
>- and Paradox support, too
>
>"Steven Green"  wrote in message news:592ddc21$1@pnews.thedbcommunity.com...
>
>wow.. me, too.. 17 users, p10, a mix of 7, 8, and 10.. one Win10 user
>started getting this on the 4th
>
>their IT guy decided that her machine must have multiple Outlook profiles,
>and was gonna blow it away and reload just one.. haven't checked back with
>them today.. now I will :-)
>
>--
>
>Steven Green
>Myrtle Beach, South Carolina, USA
>
>http://www.OasisTradingPost.com
>
>Collectibles and Memorabilia
>Vintage Lego Sets and Parts
>- and Paradox support, too
>
>"Jim Moseley"  wrote in message news:5925966b$1@pnews.thedbcommunity.com...
>
>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
>
>
>---
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>