Is there a default username/password for superadmin?
There is no default username or password for this account, but you can verify which account this is by viewing the following using ADSI Edit:
CN=IAMConfig,CN=Quest ESSO,CN=Program Data,DC=domainname,DC=com
Open up the IAMConfig object: right-click, choose "Properties"
On the "Attribute Editor" tab look for 'enatelAdmObject' in the list and click "Edit" to view the attribute value. This is the account that was used to initialize the security database and is considered the default administrator. Note that this is different from the service accounts used by the QESSO controllers.