Exhibit 5.1

                                 MIM Corporation
                               One Blue Hill Plaza
                              Pearl River, NY 10965


August 4, 1998


MIM Corporation
One Blue Hill Plaza
Pearl River, New York 10965-9670

Ladies and Gentlemen:

I am the general counsel of MIM Corporation, a Delaware corporation ("MIM"), and
have  represented MIM as such in connection with the preparation and filing with
the Securities and Exchange  Commission (the "Commission")  under the Securities
Act of 1933, as amended (the "Act"), of a Registration  Statement on Form S-4 of
MIM  (File  No.  333-  )(the  "Registration   Statement")  for  the  purpose  of
registering  3,912,448  shares of the common  stock,  par value $.0001 per share
(the  "Shares"),  of MIM. The Shares are to be issued  pursuant to the Agreement
and Plan of Merger,  dated as of January 27, 1998, as amended (the "Agreement"),
by and between MIM, CMP Acquisition  Corp., an Ohio corporation  wholly-owned by
MIM ("Sub"),  Continental  Managed Pharmacy Services,  Inc., an Ohio corporation
("Continental"),  and the individuals  named as "Principal  Shareholders" on the
signature pages to the Agreement.

In rendering the opinion set forth  herein,  I have  examined  executed  copies,
telecopies or photocopies of (i) the Registration Statement, (ii) the Agreement,
(iii) MIM's Certificate of Incorporation,  as amended,  and (iv) the Amended and
Restated  By-laws and minute books of MIM. I have  knowledge of all  proceedings
heretofore  taken and am familiar with the  proceedings  proposed to be taken by
MIM in connection with the authorization and issuance of the Shares  (summarized
in  the  Registration  Statement).  In  my  examination,   I  have  assumed  the
genuineness of all signatures and the legal capacity of all natural persons.

On the basis of such  examination,  subject to the  assumptions set forth above,
and having regard for such legal  considerations as I have deemed relevant, I am
of  the  opinion  that,  upon  approval  of the  merger  of Sub  with  and  into
Continental,  whereby Continental would become a wholly-owned subsidiary of MIM,
by the respective  stockholders  of MIM and  Continental in accordance  with the
terms and conditions  set forth in the Agreement,  and the issuance and delivery
of the  Shares in  accordance  with the terms  and  conditions  set forth in the
Agreement,  the Shares will be duly authorized,  validly issued,  fully paid and
non-assessable.

I hereby consent to the filing of this opinion as an exhibit to the Registration
Statement.

Respectfully submitted,

/s/ Barry A. Posner
General Counsel