My personal exprience with open source
portals like eXo, tells me that starting with a
large, heavy and full-of-features projects like
liferay or eXo is not a good idea. If you want
to start a project, start with less and very less
feature projects like pluto or write a new portal
from scratch. This projects need a lot of
changes (may be more than writing anew) to
support RTL, unicode, persian calendar and so
forth. And after all you suddenly hear that the
license holder restricts Iranians to access,
use, modify, or distribute the software, and then
everything's gone! I strongly suggest you to start
a new portal from scratch. If anyone is interested
in this, let the others know.

PM: Bad news for those who use Google's services
and products, these products and services are one-by-one
restrict iranians to use them: Google code, Google Desktop,
picassa and some other services are know forbidden for
Iranians, so please while start using new product or service
read terms very carefully to avoid facing license problems.