Font Size in Open Office Docs on different platforms

[Andy Campbell <fedora@xxxxxxxxxxxxxxxxxxxxx>]

When I transfer my open office documents to other platforms the font 
size ( rendered ) is changing, causing the formating to go wrong.  A 
10pt font under the Linux platform is shorter than that shown when 
running Open Office on Windows/Solaris (Gnome).  On Linux I'm getting 2 
more lines per page in a text document :-)
I tried to standardise using Microsoft's Arial font, but still the same 
problem.  I've also tried exporting to PDF.  It becomes particularly 
confusing on conference calls when I refer to a page in a document that 
doesn't match with any one else.
Strangely for presentations - the text on Linux seems to bigger and flow 
off the bottom of the slide.
Any ideas what is causing this ?  I 'm using FC5 with all the latest 
updates.
Thanks
Andy