RebuildDefaultStyles.bas

Sub RebuildDefaultStyles()

'The purpose of this macro is to remove all styles in the active
'workbook and rebuild the default styles.
'It rebuilds the default styles by merging them from a new workbook.

'Dimension variables.
   Dim MyBook As Workbook
   Dim tempBook As Workbook
   Dim CurStyle As Style

   'Set MyBook to the active workbook.
   Set MyBook = ActiveWorkbook
   On Error Resume Next
   'Delete all the styles in the workbook.
   For Each CurStyle In MyBook.Styles
      'If CurStyle.Name <> "Normal" Then CurStyle.Delete
      Select Case CurStyle.Name
         Case "20% - Accent1", "20% - Accent2", _
               "20% - Accent3", "20% - Accent4", "20% - Accent5", "20% - Accent6", _
               "40% - Accent1", "40% - Accent2", "40% - Accent3", "40% - Accent4", _
               "40% - Accent5", "40% - Accent6", "60% - Accent1", "60% - Accent2", _
               "60% - Accent3", "60% - Accent4", "60% - Accent5", "60% - Accent6", _
               "Accent1", "Accent2", "Accent3", "Accent4", "Accent5", "Accent6", _
               "Bad", "Calculation", "Check Cell", "Comma", "Comma [0]", "Currency", _
               "Currency [0]", "Explanatory Text", "Good", "Heading 1", "Heading 2", _
               "Heading 3", "Heading 4", "Input", "Linked Cell", "Neutral", "Normal", _
               "Note", "Output", "Percent", "Title", "Total", "Warning Text"
            'Do nothing, these are the default styles
         Case Else
            CurStyle.Delete
      End Select

   Next CurStyle

   'Open a new workbook.
   Set tempBook = Workbooks.Add

   'Disable alerts so you may merge changes to the Normal style
   'from the new workbook.
   Application.DisplayAlerts = False

   'Merge styles from the new workbook into the existing workbook.
   MyBook.Styles.Merge Workbook:=tempBook

   'Enable alerts.
   Application.DisplayAlerts = True

   'Close the new workbook.
   tempBook.Close

End Sub