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Problem Sending Meeting Request With Attachments

I've got code that successfully sends a Meeting Request to Outlook users - when they receive the message, it appears as a calendar invite with Accept/Decline buttons at the top. Works great.

I recently added logic to include attachments in the message - however when Outlook users receive Meeting Requests with attachments, they no longer look like calendar invites in Outlook. Instead, they look like regular email messages - no Accept/Decline buttons at the top.

To paraphase the code:

MailMessage msg = new MailMessage();

msg.From = AppSettings.GetAppSetting("emailFrom");

msg.To = EmailAddresses;

Appointment cal = new Appointment(msgLocation, msgTitle, msgDescription, dtstart, dtend, msg.From[0], EmailAddresses);

if (properties.ListItem.Attachments.Count > 0)


// code for adding attachments


//add the appointmentto mail message


// send the message with the meeting request


Looking for advice on how I might remedy this issue. Thanks in advance.


Thanks for your inquiry.

I am sorry, I could not reproduce the issue at my end with the latest version 5.5. Could you please check with the latest version at your end and test if you still receive the appointment as a regular message?