It's not even remotely the same. Microsoft is a for profit corporation. If you had enough shares you sure could prevent them from enforcing their copyright against you, but that is a different story. You might buy MS products but you do not have money automatically taken out of your pay check to go to Microsoft so that they may provide protection and basic services for you.
The State of Oregon is a state GOVERNMENT, not a corporation. It exists to serve the people of Oregon. If tax payer dollars payed for the creation of that text, it should not have a copyright assigned to it. If it was a private work by a state employee, then they should be able to sell it outside of the office but not through it.
No government, Federal, State, or Local should be able to hold copyright on a work.