The good news is that Outlook 2013 comes as both a 64 bit and 32 bit version. There were some MAPI issues with the click to run version of Outlook 2013. We didn't have that version, as it came from a CD. The down and dirty is that we ran Outlook in Administrator Mode and are once again able to email invoices as attachments in Outlook. Reference: “Our application is running in ADMIN Mode (Run as Administrator) in Windows 7 64 bit machine. Application internally calls MAPISendMail (IN C#) which will open up Outlook Message Box and user will have to click Send Button to send mail. This works fine if user has opened his Outlook in ADMIN mode , but if Outlook client is running in standard user mode, Outlook Message Box is not getting opened. Please let me know how can our application running in Admin mode can call an API which will send a mail from outlook which is already running in Standard Mode?. Is there any solution? I found the answer off this forum: social.msdn.microsoft.com/.../windows-7-and-simplemapi
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