Mont. Code Ann. § 70-28-210

Upon the completion of the publication and posting of the summons and its service upon and mailing to the persons, if any, upon whom it is hereby directed to be so specially served, the court shall have full and complete jurisdiction over the plaintiff and the property and of the person of every one having or claiming any estate, right, title, or interest in or to or lien upon such property or any part thereof and shall be deemed to have obtained the possession and control of said property for the purposes of the action and shall have full and complete jurisdiction to render the judgment therein which is provided for in this part.