Are EasySSO Server Licenses Still Available to Purchase?
Once configured with a computer account, EasySSO starts playing a role of a computer on your network for the purpose of authentication.
The underlying process when SSO is performed is similar to those happening when a user is trying to access a shared drive on another machine.
You will need a new/dedicated computer account with a password. It's not a user account or what is known as a "service" account. Please do not re-use computer accounts created for other instances of EasySSO (e.g. test environment or other Atlassian applications) - for details, see: I HAVE MULTIPLE INSTANCES OF EASYSSO - HOW MANY COMPUTER ACCOUNTS DO I NEED? in our FAQ
An account can be created (also known as "pre-staged") using standard Microsoft tools as described in this Technet article.
Password can be set from the command line using the "net user <username$> <password> /domain" command described in this Technet article.