Exhibit (a)(5)(M)

                                  VERIO INC.

        NOTICE REGARDING TREATMENT OF UNVESTED OPTIONS IN TENDER OFFER
                             UNDER THE VERIO INC.
         1996 STOCK OPTION PLAN, 1997 CALIFORNIA STOCK OPTION PLAN AND
                           1998 STOCK INCENTIVE PLAN
 (Applicable to Option Agreements with "single trigger" acceleration of vesting
                                   provision)


1. NTT Communications Corporation ("NTT Communications") has made a tender offer
   to purchase all outstanding Common Stock of Verio Inc. ("Verio") for cash at
   a price of $60.00 per share (the "Offer"). This Notice explains the effects
   of the Offer on the portion of your outstanding options to purchase shares of
   Common Stock of Verio that previously have been granted to you under the
   terms of Verio's 1996 Stock Option Plan, 1997 California Stock Option Plan
   and/or 1998 Stock Incentive Plan (as applicable, collectively and
   individually, the "Plan") and your Option Agreement(s) and that remain
   unvested immediately prior to the completion of the Offer by NTT
   Communications (the "Unvested Options"). Unless otherwise defined herein, the
   terms defined in your Option Agreement(s) and the Plan shall have the same
   defined meanings in this Notice.

2. Under the terms of your Option Agreement(s), all of your Unvested Options
   automatically will vest immediately upon completion of the Offer.
   Accordingly, upon the completion of the Offer, all of your outstanding
   Unvested Options automatically will vest, and you will be entitled to payment
   with respect to those options in the same manner as all of your other vested
   options, subject to compliance with the requirements of the letter
   accompanying this Notice.

3. Upon completion of the Offer, the Plan will be terminated and you will have
   no further rights to acquire the Verio Common Stock represented by any of
   your Unvested Options.