IBM's LAN Server and Warp Server are great products, but NET.ACC and DCDB files will get corrupted--that's a fact of life. They can be corrupted by power-failure, software, and hardware problems. In fact, if you have been running with a large number of users on your domain, or your domain is over a couple of years old, there are probably problems lurking in your files. LANICU can fix and/or rebuild these critical files from the ground up.