Specifies which account to use to access the exisiting report server catalog database during the upgrade. When omitted or ...

Specifies which account to use to access the exisiting report server catalog database during the upgrade. When omitted or when the value is empty string, the default built-in account for the current operating system.
The username part of RSUPGRADEDATABASEACCOUNT is a maximum of 20 characters long and
The domain part of RSUPGRADEDATABASEACCOUNT is a maximum of 254 characters long.