well, everybody knows the default password....
There is no need to let it default. Only if an SAP consultant asks your for access to 066 with earlywatch you need to tell him the password you have set (or reset it again). But in times of solution manager I cannot imagine, that anybody still need that user-ID.
So do waht you like: reset password, set validity, remove authorizations, lock....
b.rgds, Bernhard
