In Excel 2003 you can't change font size using conditional formatting. You
can set the font to bold.

Select the range M1:M100
Goto the menu FormatConditional Formatting
Select: Cell value is
Select Equal to
Type in the value
Click the Format button
Select the Font tab
Select Bold
OK out

--
Biff
Microsoft Excel MVP


"y2a_1984" wrote in message
...
I need to increase the font size to 9 and make bold if the value of a cell
is
located anywhere in a defined cell range (Example m1:m100). Is this
possible?