OutlookForum member X82 needs to change the subject of replies.

Instead of the subject reading "RE: Info", I must change it to a pre-set sentence like Authorization 0054213. The number will change but the first part is always the same. Is there a way of making outlook change the subject line?

A quick but "dirty" method is to use an InputBox to select a number, which then inserts the correct subject. (The code for this is at Change subject)

It's also possible to do this using a ComboxBox, but its more complicated and requires a UserForm.

Before using the macro, you need to set Outlook's macro security to Low or to warn. Then open the VBA editor using Alt+F11. More information on using the VBA editor is at How to use the VBA Editor

For a variation of the code that contains a proper Cancel command, see cancel-subjects.txt. Follow the instructions below, but add a second command button to the Userform and change the caption to Cancel.

Step 1: Create the Userform.

1. Right click on Project1 and select Insert > UserForm
2. Open the control Toolbox and select a ComboBox and add it to the UserForm.
3. Add a Command button.
4. Right click on the Command button and choose Properties.
5. Type OK (or Change Subject) in the Caption field.
6. Right click on the UserForm and choose View Code.
7. Paste the code below into the code window.
8. Change the subject titles as desired. This list is for your reference only, not the actual text that will be added to the subject. The subject text is changed in the VBA macro code.

Private Sub UserForm_Initialize()
  With ComboBox1
    .AddItem "Subject 1"
    .AddItem "Subject 2"
    .AddItem "Subject 3"
    .AddItem "Subject 4"
    .AddItem "Subject 5"
    .AddItem "no change"
End With
End Sub

Private Sub CommandButton1_Click()
    lstNo = ComboBox1.ListIndex
    Unload Me
End Sub

Step 2: Add VBA macro for reply

Next you need to add the macro that creates the reply then asks you to select the new subject.

1. Right click on Project1 and choose Insert > Module.
2. Paste the code below into the Module.
3. Change the subject lines to use the desired text. If you want to include the original subject, use oMail.Subject = "Subject " & objMail.Subject format.

To test, select a mail item and run the macro. The macro works with a selected or open message, thanks to the use of the GetCurrentItem function.

Public lstNo As Long

Public Sub ChangeSubjectOnReply()

Dim objItem As Object
Dim oMail As Outlook.MailItem

Set objItem = GetCurrentItem()
Set oMail = Application.ActiveExplorer.Selection(1).Reply

 oMail.Display
   
   UserForm1.Show

  '  MsgBox "user chose " & lstNo & " from combo"

    Select Case lstNo
    Case -1
         oMail.Subject = objItem.Subject
    Case 0
         oMail.Subject = "Subject 1"
    Case 1
        oMail.Subject = "Subject 2"
    Case 2
       oMail.Subject = "Subject 3"
    Case 3
       oMail.Subject = "Subject 4"
    Case 4
       oMail.Subject = "Subject 5"
    End Select
End Sub

Function GetCurrentItem() As Object
    Dim objApp As Outlook.Application
          
    Set objApp = Application
    On Error Resume Next
    Select Case TypeName(objApp.ActiveWindow)
        Case "Explorer"
            Set GetCurrentItem = objApp.ActiveExplorer.Selection.Item(1)
        Case "Inspector"
            Set GetCurrentItem = objApp.ActiveInspector.CurrentItem
    End Select
      
    Set objApp = Nothing
End Function

Video Tutorial

Import a ready to use form

Because this is more complicated than just pasting a macro, I have ready to use code available for download. Import it into the VBA editor and it's ready to run. ChangeSubject VBA