SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                ----------------

                                  SCHEDULE 13G
                                 (Rule 13d-102)
                                ----------------

    INFORMATION TO BE INCLUDED IN STATEMENTS PURSUANT TO RULES 13d-1(b), (c)
             AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (Amendment No. _)*


                         Magellan Health Services, Inc.
                                (Name of Issuer)

                              Ordinary Common Stock
                         (Title of Class of Securities)

                                    559079207
                                 (CUSIP Number)

                               September 14, 2007
             (Date of Event Which Requires Filing of this Statement)


     Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
     [ ]  Rule 13d-1(b)
     [X]  Rule 13d-1(c)
     [ ]  Rule 13d-1(d)

-----------

     * The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.


     The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).








Schedule 13 G
CUSIP No. 559079207                                              PAGE 2 OF 10

-----------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          OZ Management LP
-----------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                    (a) [ ]
                                                                    (b) [x]
-----------------------------------------------------------------------------
     (3)  SEC USE ONLY

-----------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
               Delaware
-----------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    2,083,655
SHARES
               -------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    0
OWNED BY       -------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    2,083,655
REPORTING      -------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    0
-----------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
          2,083,655
-----------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES                             [ ]
-----------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          5.3%
-----------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON
          IA
-----------------------------------------------------------------------------





Schedule 13 G
CUSIP No. 559079207                                              PAGE 3 OF 10

-----------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          Och-Ziff GP LLC
-----------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                    (a) [ ]
                                                                    (b) [x]
-----------------------------------------------------------------------------
     (3)  SEC USE ONLY

-----------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
               Delaware
-----------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    2,083,655
SHARES
               -------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    0
OWNED BY       -------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    2,083,655
REPORTING      -------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    0
-----------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
          2,083,655
-----------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES                             [ ]
-----------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          5.3%
-----------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON
          OO
-----------------------------------------------------------------------------





Schedule 13 G
CUSIP No. 559079207                                              PAGE 4 OF 10

-----------------------------------------------------------------------------
     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          Daniel S. Och
-----------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                    (a) [ ]
                                                                    (b) [x]
-----------------------------------------------------------------------------
     (3)  SEC USE ONLY

-----------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
               United States
-----------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    2,083,655
SHARES
               -------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    0
OWNED BY       -------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    2,083,655
REPORTING      -------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    0
-----------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
          2,083,655
-----------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES                             [ ]
-----------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
          5.3%
-----------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON
          IN
-----------------------------------------------------------------------------





Schedule 13 G
CUSIP No. 559079207                                              PAGE 5 OF 10

ITEM 1(a).  NAME OF ISSUER:
            Magellan Health Services, Inc.

ITEM 1(b).  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
            55 Nod Road, Avon, CT 06001

ITEMS 2(a), 2(b) and 2(c).   NAME OF PERSON FILING, ADDRESS OF PRINCIPAL
BUSINESS OFFICE AND CITIZENSHIP:

     This statement is filed by the entities and persons listed below, all of
whom together are referred to herein as the "Reporting Persons":

          (i) OZ Management LP ("OZ"), a Delaware limited partnership,
              with   respect to the Shares reported in this Schedule 13G held by
              certain investment funds and discretionary accounts managed
              by OZ (the "Accounts").

         (ii) Och-Ziff GP LLC ("OZGP"), a Delaware limited liability company
              which  serves as the general partner of OZ, with respect to the
              Shares reported in this Schedule 13G held by the Accounts.

        (iii) Daniel S. Och, who is the Senior Managing Member of OZGP, with
              respect to the Shares reported in this Schedule 13G managed
              by OZ and held by the Accounts.


          The citizenship of OZ and OZGP is set forth above. Daniel S. Och is a
United States citizen.

          The address of the principal business office of each of the Reporting
Persons is 9 West 57th Street, 39th Floor, New York, NY 10019.







Schedule 13 G
CUSIP No. 559079207                                              PAGE 6 OF 10

ITEM 2(d).  TITLE OF CLASS OF SECURITIES:
            Ordinary Common Stock.

ITEM 2(e).  CUSIP NUMBER:      559079207

ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO 13d-1(b) OR 13d-2(b) OR (c),
CHECK WHETHER THE PERSON FILING IS A:

          (a) [ ] Broker or dealer registered under Section 15 of the Act;

          (b) [ ] Bank as defined in Section 3(a)(6) of the Act;

          (c) [ ] Insurance Company as defined in Section 3(a)(19) of the
                  Act;

          (d) [ ] Investment Company registered under Section 8 of the
                  Investment Company Act of 1940;

          (e) [ ] Investment Adviser registered under Section 203 of the
                  Investment Advisers Act of 1940: see Rule 13d-
                  1(b)(1)(ii)(E);

          (f) [ ] Employee Benefit Plan, Pension Fund which is subject to
                  the provisions of the Employee Retirement Income Security
                  Act of 1974 or Endowment Fund; see Rule 13d- 1(b)(1)(ii)(F);

          (g) [ ] Parent Holding Company, in accordance with Rule 13d-
                  1(b)(ii)(G);

          (h) [ ] Savings Associations as defined in Section 3(b) of the
                  Federal Deposit Insurance Act;

          (i) [ ] Church Plan that is excluded from the definition of an
                  investment company under Section 3(c)(14) of the Investment
                  Company Act of 1940;

          (j) ( ) Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

         IF THIS STATEMENT IS FILED PURSUANT TO Rule 13d-1(c), CHECK THIS
BOX. [x]







Schedule 13 G
CUSIP No. 559079207                                              PAGE 7 OF 10

ITEM 4.   OWNERSHIP.

           OZ serves as principal investment manager to a number of investment
funds and discretionary accounts with respect to which it has voting and
dispositive authority over the Shares reported in this Schedule 13G. OZGP serves
as the general partner of OZ. As such, it may be deemed to control OZ and
therefore may be deemed to be the beneficial owner of the Shares reported in
this Schedule 13G. Mr. Daniel S. Och is the Senior Managing Member of OZGP. As
such, he may be deemed to control such entity and therefore may be deemed to be
the beneficial owner of the Shares reported in this Schedule 13G.
          Each of the Reporting Persons hereby disclaims any beneficial
ownership of any such Shares.

     A.  OZ
         (a) Amount beneficially owned: 2,083,655
         (b) Percent of class: 5.3%
             (All percentages herein are based on 39,565,274 shares of Common
             Stock reported to be outstanding as of June 30, 2007, as reflected
             in the Form 10-Q filed by the Company on July 27, 2007).
         (c) Number of shares as to which such person has:
                  (i)    sole power to vote or to direct the vote
                         2,083,655
                  (ii)   shared power to vote or to direct the vote 0
                  (iii)  sole power to dispose or to direct the disposition of
                         2,083,655
                  (iv)   shared power to dispose or to direct the disposition of
                         0
     B.  OZGP
         (a) Amount beneficially owned: 2,083,655
         (b) Percent of class: 5.3%
         (c) Number of shares as to which such person has:
                  (i)    sole power to vote or to direct the vote 2,083,655
                  (ii)   shared power to vote or to direct the vote 0
                  (iii)  sole power to dispose or to direct the disposition of
                         2,083,655
                  (iv)   shared power to dispose or to direct the disposition of
                         0
     C.  Daniel S. Och
         (a) Amount beneficially owned: 2,083,655
         (b) Percent of class: 5.3%
         (c) Number of shares as to which such person has:
                  (i)    sole power to vote or to direct the vote 2,083,655
                  (ii)   shared power to vote or to direct the vote 0
                  (iii)  sole power to dispose or to direct the disposition of
                         2,083,655
                  (iv)   shared power to dispose or to direct the disposition of
                         0





Schedule 13 G
CUSIP No. 559079207                                              PAGE 8 OF 10

ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.
         Not applicable.

ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.
         See Item 4.

ITEM 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
         THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY. Not
         applicable.

ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.
         See Item 4.

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP.
         Not applicable.

ITEM 10. CERTIFICATION.  (if filing pursuant to Rule 13d-1(c))

         Each of the Reporting Persons hereby make the following certification:

         By signing below each Reporting Person certifies that, to the best of
its knowledge and belief, the securities referred to above were not acquired and
are not held for the purpose of or with the effect of changing or influencing
the control of the issuer of the securities and were not acquired and not held
in connection with or as a participant in any transaction having that purpose or
effect.





Schedule 13 G
CUSIP No. 559079207                                              PAGE 9 OF 10


                                   SIGNATURES

         After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certify that the information set forth in this statement is
true, complete and correct.

DATED:  September 24, 2007          /s/ Daniel S. Och
                                    -----------------------------------
                                    OZ MANAGEMENT LP
                                    By Och-Ziff GP LLC
                                    its general partner
                                    By Daniel S. Och
                                    Senior Managing Member

                                    /s/ Daniel S. Och
                                    -----------------------------------
                                    OCH-ZIFF GP LLC
                                    By Daniel S. Och
                                    Senior Managing Member

                                    /s/ Daniel S. Och
                                    -----------------------------------
                                    Daniel S. Och








Schedule 13 G
CUSIP No. 559079207                                              PAGE 10 OF 10


                                    EXHIBIT 1

                           JOINT ACQUISITION STATEMENT
                            PURSUANT TO RULE 13d-1(k)


         The undersigned acknowledge and agree that the foregoing statement on
Schedule 13G is filed on behalf of each of the undersigned and that all
subsequent amendments to this statement on Schedule 13G shall be filed on behalf
of each of the undersigned without the necessity of filing additional joint
acquisition statements. The undersigned acknowledge that each shall be
responsible for the timely filing of such amendments, and for the completeness
and accuracy of the information concerning him or it contained therein, but
shall not be responsible for the completeness and accuracy of the information
concerning the others, except to the extent that he or it knows or has reason to
believe that such information is inaccurate.


DATED:  September 24, 2007          /s/ Daniel S. Och
                                    -----------------------------------
                                    OZ MANAGEMENT LP
                                    By Och-Ziff GP LLC
                                    its general partner
                                    By Daniel S. Och
                                    Senior Managing Member

                                    /s/ Daniel S. Och
                                    -----------------------------------
                                    OCH-ZIFF GP LLC
                                    By Daniel S. Och
                                    Senior Managing Member

                                    /s/ Daniel S. Och
                                    -----------------------------------
                                    Daniel S. Och