I have been using Visio since it's release and I have always had the function to change text so it appears vertical. You can do this in all MS office products. I have a new installation of Visio 2007 Pro and I didnt see the button on the tool bar. So I opened up help and got this:
Select the shape.
Click the Change Text Direction button .
The shape's text rotates 90° clockwise and appears in a vertical font.
Note To display the Change Text Direction tool, on the Tools menu, click Options, click the Regional tab, and, in the Asian text list, click Show.
I looked at the note and thought OK, I will change this setting. But when I open tools and options, there is no Regional tab to select the Asian text list. and click show. No tab exists.
I installed the same software on another machine and it has the same issue. I can go to the tool bar and customize it and drag the Change Text Direction button to the tool bar, but as soon as I click OK, it disappears.
I have searched the web and people are having the same issue, but then they are told to go to tools --> options --> regional setting and in the Asian text list, click Show. This fixes their issue, but for me, I dont have that tab.