Hi,
courtesy of Allen Wyatt:
http://excel.tips.net/Pages/T002974_Setting_the_Default_Font_Size_for_Comment_Balloons.html
"Excel does not provide a way for you to change the default font
specifications for comment balloons, across the board. You can change them
individually (as already mentioned), but not universally within Excel. You
can make a change in Windows that will affect the comment font, however.
Follow these general instructions:
Right-click anywhere on the desktop. Windows displays a Context menu.
Choose Properties. Windows displays the Display Properties dialog box.
Make sure the Appearance tab is selected. (Click here to see a related
figure.)
In some versions of Windows you should click the Advanced button. Windows
displays the Advanced Appearance dialog box. (Click here to see a related
figure.)
Using the Item drop-down list, choose ToolTip.
Using the other controls in the dialog box, change the font specifications
as desired.
Click OK, as necessary, to close all the open dialog boxes.
In case you didn't figure it out from these steps, the font used in the
comment balloons of Excel is determined by the ToolTip font used by Windows.
Changing the ToolTip font changes the comment balloons, but it also changes
things in other applications besides Excel, as well. (Of course, if you think
the font is too small in the comment balloons, you also probably think the
font is too small everywhere else the ToolTip font is used.)
If you prefer to not change the ToolTip font, you can create an Excel macro
that will step through all the comments in a worksheet to make changes.
Sub FixComments()
Dim cmt As Comment
For Each cmt In ActiveSheet.Comments
With cmt.Shape.TextFrame.Characters.Font
.Name = "Arial"
.Size = 12
End With
Next cmt
End Sub
This macro changes the font to 12-point Arial for all comments. You could
easily change the font and font size by making a change to the appropriate
two lines of the macro."
If this helps, please click the Yes button,
Cheers,
Shane Devenshire