You could do this with a macro. From vba help

Worksheets("Sheet1").Range("A1:D4").BorderAround _
ColorIndex:=3, Weight:=xlThick

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Don Guillett
SalesAid Software

"Fancy1" wrote in message
...
I discovered that if you click on the Borders icon on the Formatting
toolbar, after you have created your Conditioning Formatting, click on Draw
Borders . . . you can change the borders as thick as you want. Use the
slide bar and scroll down to select the border you want. You will have many
to choose from.

Yes, you will have to go over & trace each cell by hand, but the borders
are definitely thicker!!