A read-only property that returns a reference to the MailEnvelope object associated with the window that is represented by the Window object.
expression.MailEnvelope
expression Required. An expression that returns a reference to the Window object.
2: Can be accessed only by forms running in the same domain as the currently open form, or by forms that have been granted cross-domain permissions.
The MailEnvelope property can be used only with the editing window types; if used with a designing window type, it will return an error. It will also return an error if no form is open in the form area.
In the following example, the MailEnvelope property of the Window object is used to set a reference to the MailEnvelope object, which is then used to create and display a custom e-mail message:
var objEmail;
objEmail = Application.ActiveWindow.MailEnvelope;
objEmail.Subject = "Test e-mail message";
objEmail.Visible = true;