How do I set up Outlook to send a auto reply during a certain hour of the day every day?

Where your name is in the To box.

Public Sub Check_ReceivedTime(newMail As Outlook.MailItem)

Dim obj As Object
Dim ReceivedHour As Integer
Dim newReply As MailItem
Dim msg As String

ReceivedHour = Hour(newMail.ReceivedTime)

If ReceivedHour < 15 Then

    Set newReply = newMail.reply
    msg = "I will respond some time after 3 pm."

    CreateMail newReply.To, msg

Else

    Debug.Print "After 3. Do not sent the automated reply."

End If

Set newReply = Nothing

End Sub


Private Sub CreateMail(ReplyAddress As String, msg As String)

Dim objMail As Outlook.MailItem

Set objMail = CreateItem(olMailItem)

With objMail
    .To = ReplyAddress
    .Body = msg

    .Display
    ' or
    ' .Send

End With

End Sub

Edit: Paste the code into the VBA editor. The code will be availabel in "run a script".

See also http://www.slipstick.com/outlook/rules/outlooks-rules-and-alerts-run-a-script/