First of all: There is no such thing as "pressing charges." This is a common misconception. Criminal charges are investigated by the police and referred to the District Attorney, who decides whether to file a case or not. Private citizens, including crime victims, can contact the police to report a crime and can cooperate with the DA in making their case, but that's all they can do. They have no legal authority to compel (or to refuse to allow) a criminal prosecution.
That said, crime victims do have certain rights under the Oregon constitution. To take advantage of these rights, you need to be certified as a victim by the court. (It's not clear from your question whether you were the victim of a crime, but I assume from your use of language that you might have been.) These include the right to be present at critical stages of the proceedings, to be consulted about charging decisions (but not to unilaterally make those decisions), and to resist discovery attempts from the defendant. But they do not include the right to refuse to appear for a subpoena. If you have been summoned by a subpoena, then legally, you must appear. Failure to do so could result in a warrant for your arrest, which the Michigan police forces could execute.(An incorrect address does not invalidate the legal force of the subpoena.) Furthermore, if you appear as a witness in court, you are required to tell the truth - you cannot decide "not to testify against" anyone. You do have the right to request reasonable fees and reimbursement for your travel - which, if you're coming from Michigan, could be pretty substantial.
Obviously I don't know just what all happened, but I would suggest that you contact an attorney in Oregon and see if you're eligible to receive victim status in the case. This would give you a lot more options in dealing with the DA, and grant you a voice in the process which might compel them to dismiss it if that's really what you want.
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ORS 136.595 says that in criminal cases, subpoenas must be delivered to witnesses personally. So if someone just receives the DA's subpoena in their mailbox, that is not personal delivery and that subpoena has no force of law behind it. Depending on what the subpoena says, it may actually be a fraud.
However, if you are interested in getting the government to stop its persecution of this defendant, there are other things you can do. You should call a criminal defense lawyer for specific advice.
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Not only is there a defect in the manner of service, but it is my recollection that an Oregon subpoena, by itself, cannot compel you to appear from out of state. There are some other, more complex, procedures for procuring out of state witnesses, but that seems unlikely in these circumstances. Follow the suggestion that you make sure the defendant has a lawyer, and then work with the lawyer to get the charges dismissed (which seems like a real possibility, given that you, the victim, are a reluctant out-of-state witness.
This comment is general in nature and is not intended as legal advice. It does not create an attorney client relationship and obviously is not confidential. You should contact an attorney in your area who can review with you all of the relevant facts and give you specific legal advice.