Not sure if this is an option in Excel 2003 but in XP you can add a
toolbar button to do this.

On the toolbar you want to add the feature to click on "Add orRemove
Buttons". Select "Customize". On the Commands Tab select "Format"
from the Categories list and scroll down the options on the right and
click "Vertical Text" and drag it to the toolbar you want to add it to.


You can then either type the text in the cell you want and then click
on the new toolbar button to convert the text, or select the toolbar
first then type your text. When you move to the next cell, it will
convert.

Cheers,

Steve


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SteveG
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