dear comifreak,
since you can see non of us seam to understand what you are trying to ask,
and thus maybe its not as simple question after all... you should also try to ask
good questions, so that people may clearly understand what your are looking for.
For now i will list a few '
did you know's about the installing process, in the hope of answering your question non the less, if your answer is still not there, please don't try to acuse anyone, but instead try to explain in detail or by example, what you meant to ask in the first place...
1> the installer proces if set to automagically will repartion a diskdrive, (destroying all data on it),
2> if manual installing, you can remove all partions expept those where you data is living ... if there is a 'create a new partition table option dont toutch or tick it and your data will stay untouched...
3> if your data has not been removed by the installer (see 1 and 2), nothing has been changed to your /home partion after the new system has been installed exept for 1 thing... there is a new home folder for the user created during the setup procedure...
4a> the easiest way to give back the data to the people who previously owned them is by recreating thare useraccounts and using the chown and chmod commands to give the proper rights back to the proper user accounts...
4b> there may be a way to recreate the old user account in sutch a 100% identical way, that chown and chmod are not neaded, but there is no garantees that this will work flawlessly.
5> there are no scripts or systems in place that will automagically remap previous data to current users, recreate previously shared documents, or safegart that uids are the same as last time. unless, instead of using the installer, you are using a recovery system like disaster recovery or a system cloning tool like ghost.
i hope this will help you answer your question..