Hi Nikos,
In addition to what Suzanne is writing below, which is absolutely perfect, I
would add this, since I don't really know whether you are based in the US or
not:
Customers can only purchase products in the online store for their region
(accessible from the localized Office Online sites). Otherwise, credit card
validation will fail. So if you are from outside the USA, customers should
not try to purchase these Single Language Packs from a US site. For Western
Europe, for instance, the purchase site can be directly accessed via
http://buy.trymicrosoftoffice.com/buyemea1. For the rest of Europe, the URL
is
http://buy.trymicrosoftoffice.com/buyemea2.
You'll find more information about Office 2007 Language Packs here:
http://office.microsoft.com/en-us/suites/FX102113661033.aspx
I hope it helps,
Best wishes,
Thierry Fontenelle [MSFT]
Microsoft Natural Language Group