EXHIBIT 23(a) CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation by reference in this registration statement of our report dated June 8, 1999 included in Norstan, Inc.'s Form 10-K for the year ended April 30, 1999 and to all references to our Firm included in this registration statement. /s/ Arthur Andersen LLP Minneapolis, Minnesota, March 13, 2000 10