Exhibit 5.1


                     [LETTERHEAD OF MORRISON & FOERSTER LLP]



                                  July 14, 2003


Wire One Technologies, Inc.
225 Long Avenue
Hillside, New Jersey 07205

Ladies and Gentlemen:

                  At your request, we have examined the Registration Statement
on Form S-3 filed by Wire One Technologies, Inc., a Delaware corporation (the
"Company"), with the Securities and Exchange Commission (the "Commission") on
February 14, 2003 (Registration No. 333-103227) (the "Registration Statement"),
as amended by Amendment No. 1 on March 31, 2003, as amended by Amendment No. 2
on April 30, 2003 and as amended by Amendment No. 3 on July 2, 2003, relating
to the registration under the Securities Act of 1933, as amended (the "Act"), of
3,728,162 shares of the Company's common stock, par value $.0001 per share (the
"Shares") being offered by certain selling shareholders (the "Selling
Stockholders").

                  This opinion is being delivered in accordance with the
requirements of Item 601(b)(5) of Regulation S-K under the Act. All capitalized
terms used herein and not otherwise defined shall have the respective meanings
assigned to them in the Registration Statement.

                  As counsel to the Company, we have examined the proceedings
taken by the Company in connection with the authorization of the issuance by the
Company of the Shares to the Selling Stockholders. In such examination, we have
assumed the genuineness of all signatures and the authenticity of all items
submitted to us as originals and the conformity with originals of all items
submitted to us as copies.





                     [LETTERHEAD OF MORRISON & FOERSTER LLP]


Wire One Technologies, Inc.
July 14, 2003
Page Two


                  In connection with this opinion, we have examined originals or
copies of the certificate of incorporation and the bylaws, each as amended to
date, of the Company. In addition, we have examined such records, documents,
certificates of public officials and the Company, made such inquiries of
officials of the Company and considered such questions of law as we have deemed
necessary for the purpose of rendering the opinions set forth herein.

                  Based upon and subject to the foregoing, we are of the opinion
that the Shares that may be sold by the Selling Stockholders have been duly
authorized for issuance by all necessary corporate action on the part of the
Company and (i) with respect to the 163,788 shares that have heretofore been
issued, such shares are validly issued, fully paid and non-assessable and (ii)
with respect to the 3,564,374 shares that have not yet been issued, such shares
when so issued, will be validly issued, fully paid and non-assessable.

                  We express no opinion as to matters governed by any laws other
than the General Corporation Law of the State of Delaware as in effect on the
date hereof.

                  We hereby consent to the filing of this opinion with the
Commission in connection with the filing of the Registration Statement and any
amendments thereto. We also consent to the use of our name in the related
prospectus under the heading "Legal Matters". In giving this consent, we do not
thereby admit that we are in the category of persons whose consent is required
under Section 7 of the Act.


                                           Very truly yours,



                                           Morrison & Foerster LLP