Yes,

After you have exported to Excel, you can open the Excel workbook and use
automation to change your formatting of that column.  The way I would do this
is:

1.  Export your report to Excel.
2.  Open Excel, and record a new macro.  Once you have started recording the
new macro:
   a. Select the column you want to format.
   b. Click on the Formatting - Conditional Formatting menu item.
   c. Set your appropriate formatting options
   d. Stop recording the macro
3. Open the Excel VB editor, find the macro you just created, and copy the
code for the formatting and paste it into an Access code module.  Add some
code to open Excel, open the spreadsheet, and then do the formatting.  It
will look something like below (this is from a macro I run):

Public Sub ExcelConditionalFormatting

   dim xlObj as object
   dim wbk as object

   set xlObj = createobject("Excel.Application")
   xlObj.visible = true
   set wbk = GetObject("FileName.xls")
   wbk.visible = true
   wbk.sheets(1).activate

   Sheets(1).Range("C:C").Select
   
   Selection.FormatConditions.Delete
   Selection.FormatConditions.Add Type:=xlExpression, Formula1:=strFormula
   With Selection.FormatConditions(1).Font
       .Bold = True
       .Italic = False
       .ColorIndex = 2
   End With
   Selection.FormatConditions(1).Interior.ColorIndex = 3
   Selection.FormatConditions.Add Type:=xlCellValue, Operator:=xlLess, _
                                  Formula1:="=" & Chr$(64 + SelCol) & "3"
   With Selection.FormatConditions(2).Font
       .Bold = False
       .Italic = False
       .ColorIndex = xlAutomatic
   End With
   Selection.FormatConditions(2).Interior.ColorIndex = 19
   Selection.FormatConditions.Add Type:=xlCellValue, Operator:=xlGreater, _
       Formula1:="=" & Chr$(64 + SelCol) & "4"
   With Selection.FormatConditions(3).Font
       .Bold = False
       .Italic = False
       .ColorIndex = xlAutomatic
   End With
   Selection.FormatConditions(3).Interior.ColorIndex = 44

   wbk.close SaveChanges:=True
   xlObj.Quit

End Sub

You can do this without making Excel visible if you want, or could keep it
hidden until the formatting is complete, then make it visible.  You might
even want to just save the changes (wbk.save) and leave off the close and
quit methods as the last two lines of this subroutine.

HTH
Dale