Data is there but encryption table is damaged.  So far all attempts to import data have been to no avail.  Apparently IT company was not backing up .dat files.  This was contrary to our contract that all info on hard drive was to be backed up every night.  

They said they do not back up dat files because they are constantly changing and the programs generally rebuild them like outlook.  This is not the right answer but how would we have known.

Our problem is that this is a reputable regional firm.

Thank you for your input