MailItem.IsConflict Property (Outlook)
Office 2013
Returns a Boolean that determines if the item is in conflict. Read-only.
The following Microsoft Visual Basic for Applications (VBA) example creates a new mail item and attempts to send it. If the IsConflict property returns True, the item will not be sent.
Sub NewMail() 'Creates and tries to send a new e-mail message. Dim objNewMail As Outlook.MailItem Set objNewMail = Application.CreateItem(olMailItem) objNewMail.Body = _ "This e-mail message was created automatically on " & Now objNewMail.To = "Jeff Smith" If objNewMail.IsConflict = False Then objNewMail.Send Else MsgBox "Conflict: Cannot send mail item." End If Set olApp = Nothing Set objNewMail = Nothing End Sub