EX-5.1
                   Opinion of Wilson Sonsini Goodrich & Rosati


                                                                     Exhibit 5.1


   
                                February 24, 1999
    



Xiox Corporation
557 Airport Boulevard, Suite 700
Burlingame, CA 94010

   
        Re: Xiox Corporation (the "Company") Registration Statement on Amendment
            3 to Form S-3
    

Ladies and Gentlemen:

   
        We have examined the  Registration  Statement on Amendment 3 to Form S-3
to be filed with the  Securities  and  Exchange  Commission  (the  "Registration
Statement"),  in connection  with the  registration  under the Securities Act of
1933, as amended,  of a shelf offering of (i) 2,693,686  shares of the Company's
common  stock,  $.01 par value per share  (the  "Shares")  and (ii) up to 50,000
shares of the Company's  common stock,  $.01 par value per share,  issuable upon
exercise  of certain  warrants  to purchase  common  stock of the  Company  (the
"Warrant Shares"). As your counsel, we have examined the proceedings proposed to
be taken in  connection  with the  sale  and  issuance  of the  above-referenced
securities.
    

        It is our opinion that the Shares are, and that the Warrant  Shares when
issued upon exercise of the warrants  referred to in the Registration  Statement
will be, legally and validly issued, fully paid and nonassessable.

        We consent to the use of this opinion as an exhibit to the  Registration
Statement,  and further consent to the use of our name wherever appearing in the
Registration  Statement,  including the Prospectus  constituting a part thereof,
and any amendment thereto.


                                     Very truly yours,

                                     WILSON, SONSINI, GOODRICH & ROSATI
                                     Professional Corporation


                                     / / Wilson Sonsini Goodrich & Rosati


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