The winmail.dat file is m$ electronic business card. So far nobody has come up with any exploit to ruin the address book. It contains extended information allowing a person to transmit complete contact information for the event that another winblows user adds them to the address book. Generally when m$ uses the extension .dat it is a bianary format that uses a tree structure for storage. For more complete information look up information on the format of the registry. That is the largest example of the format. HAving said this, it doesn't always hold true. ======= Kirk Wood Cpt.Kirk at 1tree.net Nowlan's Theory: He who hesitates is not only lost, but several miles from the next freeway exit.