My company CodeSyntax has produced the Basque version of OpenGroupware. We have put it into use in our own company and in several developments for customers.

Next you can see the schedule I had a month ago, the first week of November:

All Saints' Day, the day after Halloween, conveniently localised in Basque as Domu Santu eguna. See more screenshots there.

This Basque localisation, is already part of the official translation efforts registered at OpenGroupware.org

We have also connected OpenGroupware.org to Zope, integrating this tool into the CPS framework.

So, we may say that we have some experience installing and customizing OpenGroupware.org, the leading open source groupware server.