Du coup après quelques recherche j'ai trouvé cette maccro.
Sub AlwaysReplyInHTML()
Dim oSelection As Outlook.Selection
Dim oItem As Object
'Get the selected item
Select Case TypeName(Application.ActiveWindow)
Case "Explorer"
Set oSelection = Application.ActiveExplorer.Selection
If oSelection.Count > 0 Then
Set oItem = oSelection.Item(1)
Else
MsgBox "Please select an item first!", vbCritical, "Reply in HTML"
Exit Sub
End If
Case "Inspector"
Set oItem = Application.ActiveInspector.CurrentItem
Case Else
MsgBox "Unsupported Window type." & vbNewLine & "Please select or open an item first.", _
vbCritical, "Reply in HTML"
Exit Sub
End Select
Dim oMsg As Outlook.MailItem
Dim oMsgReply As Outlook.MailItem
Dim bPlainText As Boolean
'Change the message format and reply
If oItem.Class = olMail Then
Set oMsg = oItem
If oMsg.BodyFormat = olFormatPlain Then
bPlainText = True
End If
oMsg.BodyFormat = olFormatHTML
Set oMsgReply = oMsg.Reply
If bIsPlainText = True Then
oMsg.BodyFormat = olFormatPlain
End If
oMsg.Close (olSave)
oMsgReply.Display
'Selected item isn't a mail item
Else
MsgBox "No message item selected. Please select a message first.", _
vbCritical, "Reply in HTML"
Exit Sub
End If
'Cleanup
Set oMsgReply = Nothing
Set oMsg = Nothing
Set oItem = Nothing
Set oSelection = Nothing
End Sub
Mais cela applique que sur un seul destinataire