I'm going to assume that you have a regular table (no merged cells) and at least 2 columns and the code should be comparing the words in the first cell with all other cells on that row (like the original email). If these assumptions are correct then this modification to Paul's very elegant code should work.
Code:
Sub Demo()
Application.ScreenUpdating = False
Dim Tbl As Table, Rng As Range, strTxt As String, i As Long, j As Long
Options.DefaultHighlightColorIndex = wdYellow
For Each Tbl In ActiveDocument.Tables
With Tbl
For i = 1 To .Rows.Count
Set Rng = .Rows(i).Range
Rng.Start = .Cell(i, 2).Range.Start
With .Cell(i, 1).Range
For j = 1 To .Words.Count
strTxt = Trim(.Words(j))
With Rng.Find
.ClearFormatting
.Text = strTxt
With .Replacement
.ClearFormatting
.Highlight = True
.Text = "^&"
End With
.Format = True
.Forward = True
.MatchCase = False
.MatchWholeWord = True
.MatchWildcards = False
.Wrap = wdFindStop
.Execute Replace:=wdReplaceAll
End With
Next
End With
Next
End With
Next
Application.ScreenUpdating = True
End Sub