I use Accounts Plus 2018 and Windows 10 Pro.
The system did an update of Office yesterday and now I get the above error when I try to email an invoice.
I have restarted the saystem.
I'd recommend checking out the information in this help guide for the MAPI error message. It outlines the causes and a couple of solutions as well -
HELP GUIDE: MAPI Error when emailing from Reckon Accounts Business Range
Thank you very much.
For the moment I am saving as PDF and then emailing. Time consuming and irritating but at least I'm emailing invoices.