Here is the official answer from Symantec/PGP support about Outlook 2010; http://www.symantec.com/docs/TECH157467
What you are seeing at the link you have provided me with is a misprint that I will need to address with the site developers. Thank you for pointing that out, and Sorry for the misprint. I would also suggest bookmarking or subscribing to the above article, as we will update the information as soon as a version of PGP is compatible with Outlook 2010.
As for where to get the latest version of the software there is another article that is for a different issue, but has a PDF that I designed to walk you through the process of obtaining the latest software release.
http://www.symantec.com/docs/TECH163224
http://www.symantec.com/business/support/resources/sites/BUSINESS/content/live/TECHNICAL_SOLUTION/163000/TECH163224/en_US/Obtain%20PGP%20Desktop.pdf
Let us know if there is anything further that we can do for you.
Thanks,
H Robinson,
Symantec Support