EXHIBIT 4.24

                                  WAM!NET INC.


                            A MINNESOTA CORPORATION

                                        

No. 1                                                     115,206 Shares of 1999
                                                         Class A Preferred Stock


          This certifies that MCI WORLDCOM, Inc. is the registered holder of One
                              ------------------                                
Hundred Fifteen Thousand Two Hundred Six Shares of 1999 Class A Preferred Stock,
par value $10.00 per share (see reverse side), transferable only on the books of
the Corporation by the holder hereof in person or by Attorney upon surrender of
this Certificate properly endorsed.

          IN WITNESS WHEREOF, the said Corporation has caused this Certificate
to be signed by its duly authorized officers this 4th day of March, 1999.

                              /s/ Edward J. Driscoll III
                              --------------------------
                              Edward J. Driscoll III, President

                              /s/ Edward J. Driscoll, Jr.
                              ---------------------------
                              Edward J. Driscoll, Jr. Secretary

 
          The 1999 Class A Preferred Stock has the rights and preferences, and
is subject to mandatory redemption, as set forth in the Certificate of
Designation of 1999 Class A Preferred Stock as filed of record with the
Minnesota Secretary of State on March 4, 1999.

          The securities evidenced hereby are subject to the terms of that
certain Stockholders Agreement, dated as of March 4, 1999, by and among the
Corporation, Silicon Graphics, Inc. and MCI WORLDCOM, Inc., including certain
restrictions on transfer.  A copy of this Agreement has been filed with the
Secretary of the Corporation and is available upon request.  The securities
evidenced hereby have not been registered under the Securities Act of 1933, as
amended (the "Act") and may not be resold, transferred or otherwise disposed of
other than in a transaction exempt from, or not subject to, the registration
requirements of the Act or pursuant to an effective registration statement
hereunder.

          For value received, ______________________________ does hereby sell,
assign and transfer unto ____________________________

          _____________________________________ Shares represented by the within
Certificate and does hereby irrevocably constitute and appoint
_____________________________ Attorney to transfer the said Shares on the books
of the within named Corporation with full power of substitution in the premises.

Dated:


Note:  The signature on this assignment must correspond with the name as written
upon the face of the Certificate, in every particular, without alteration or
enlargement or any change whatever.

                                      -2-