OCS 2007 R2 – Planning: Workbook and Tool that you can get more information on it here, is a great planning tool!
This issue below is fixed in the release: https://www.microsoft.com/downloads/details.aspx?FamilyID=fdf32585-c131-4832-8e27-67e70636c1e8&DisplayLang=en
But if you don't use the MS prefered Language setup in the OS (US-English) :)
You can get in to problems when doing a export of the setup to Visio.
To be exact when you try to open the Visio export you might get this error:
The problem is the delimiter in your language setup, in the OS, in my case it is Danish and here the delimiter is "," comma and not . dot, the quick solution for this is to do a search for "," and replace it with "." in the *.vdx file.