About Digital Office Systems  Digital Office Systems, LLC develops, markets, trains and supports the products listed on this web site. Our principal office is located at 1917 Market St., Denver, CO 80202. Our main office phone number is (303) 929-2990. Partnering inquiries are welcomed and should be addressed to partnering@DigitalOfficeSystems.com Digital Office Systems LLC is a privately owned limited liability company. We are not seeking investors at this time. Privacy Policy. We collect and retain registration information from our users so that we can identify our userbase. We may use that information to communicate with our existing users and those who have expressed an interest in our products about new or existing products and product upgrades. We do not currently share any of the information we collect from users or others with any other source and do not intend to do so.