Exhibit 23.1 CONSENT OF INDEPENDENT AUDITORS As independent public accountants, we hereby consent to the incorporation by reference in this Registration Statement on Form S-3, to be filed on January 23, 1999, of our report dated March 10, 1999, included in Online System Services, Inc. Form 10-KSB for the year ended December 31, 1998 and to all references to our Firm included in this Registration Statement. /s/ Arthur Andersen LLP Denver, Colorado April 23, 1999