Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

BALL BENJAMIN

2. Date of Event Requiring Statement (MM/DD/YYYY) 12/29/2016

3. Issuer Name and Ticker or Trading Symbol

MITEL NETWORKS CORP [MITL]

(Last) (First) (Middle)

ONE LETTERMAN DRIVE, BUILDING C - SUITE

4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)

(Street)

SAN FRANCISCO, CA 94129

(City) (State) (Zip)

5. If Amendment, Date Original Filed (MM/DD/YYYY)

6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Shares	8974	D
Common Shares	6281568	I	Owned by Arsenal HoldCo I S.a.r.l ⁽¹⁾ ⁽²⁾ ⁽³⁾ ⁽⁴⁾ ⁽⁵⁾
Common Shares	2424602	I	Owned by Arsenal HoldCo II S.a.r.l ⁽¹⁾ ⁽²⁾ ⁽³⁾ ⁽⁶⁾ ⁽⁷⁾
Common Shares	72405	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾

*Table II - Derivative Securities Beneficially Owned ( e.g.* , puts, calls, warrants, options, convertible securities)**
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
Restricted Stock Units	⁽⁸⁾	⁽⁸⁾	Common Shares	10000	⁽⁸⁾	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	3/4/2017	3/4/2023	Common Shares	10000	$7.17	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	12/31/2015	5/14/2022	Common Shares	20000	$8.94	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	3/5/2015	3/5/2022	Common Shares	966	$9.70	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	11/13/2014	11/13/2021	Common Shares	6972	$9.96	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	8/14/2014	8/14/2021	Common Shares	6828	$9.96	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	5/20/2014	5/20/2021	Common Shares	6828	$10.83	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	2/5/2014	2/5/2021	Common Shares	6909	$8.79	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	12/12/2013	12/12/2020	Common Shares	7061	$9.58	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	9/5/2013	9/5/2020	Common Shares	8588	$4.64	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	7/1/2013	7/1/2020	Common Shares	20263	$3.80	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	3/7/2013	3/7/2020	Common Shares	20263	$3.94	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	12/6/2012	12/6/2019	Common Shares	20194	$3.06	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	9/6/2012	9/6/2019	Common Shares	21569	$2.61	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	6/26/2012	6/26/2019	Common Shares	22343	$4.22	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	3/7/2012	3/7/2019	Common Shares	18131	$3.44	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	12/23/2011	12/23/2018	Common Shares	18819	$3.05	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	9/7/2011	9/7/2018	Common Shares	21250	$3.29	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	7/7/2011	7/7/2018	Common Shares	28336	$4.00	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾
Options (Common Shares)	9/16/2011	9/16/2017	Common Shares	62200	$6.50	I	Owned by Francisco Partners Management, LLC ⁽¹⁾ ⁽²⁾

Explanation of Responses:
( 1)	Benjamin Ball is a partner of Francisco Partners Management, LLC ("Francisco Partners"), has voting and investment power over the common shares (the "Common Shares") of Mitel Networks Corporation (the "Company") held by each of Francisco Partners Management, LLC, Arsenal HoldCo I S.a.r.l. ("Arsenal I") and Arsenal HoldCo II S.a.r.l. ("Arsenal II"; each of Mr. Ball, Francisco Partners, Arsenal I and Arsenal II, a "Entity", and together, the "Entities"), and therefore may be deemed to beneficially own the Common Shares held by each of Francisco Partners, Arsenal I and Arsenal II. Mr. Ball expressly disclaims such beneficial ownership except to the extent of any pecuniary interest therein.
( 2)	(Continued from footnote 1) In addition, the Entities may be deemed to be a member of a group, within the meaning of Rule 13d-5 of the Securities Exchange Act of 1934, as amended (the "Exchange Act") and may be deemed to share voting and investment power over the Common Shares, and thus be deemed to beneficially own, the Common Shares held by each other Entity. The filing of this Form 3 shall not be construed as an admission that the Entities share beneficial ownership of these shares, and the Entities expressly disclaim such beneficial ownership.
( 3)	Pursuant to Rule 13d-5 of the Exchange Act, by reason of the relationships described herein, Arsenal I and Arsenal II may be deemed to share beneficial ownership of the Common Shares held by Arsenal I and Arsenal II. The filing of this Form 3 shall not be construed as an admission that Arsenal I and Arsenal II beneficially own those shares held by the other Entity.
( 4)	Francisco Partners II (Cayman), L.P. ("FP II Cayman"), as the sole member of Arsenal I, Francisco Partners GP II (Cayman), L.P. ("FP GP II Cayman"), as the general partner of FP II Cayman, and Francisco Partners GP II Management (Cayman) Limited ("FP Management Cayman"), as the general partner of FP GP II Cayman, may also be deemed to share voting and investment power of the Common Shares beneficially owned by Arsenal I. Except to the extent of its interests as sole member of Arsenal I, FP II Cayman expressly disclaims such beneficial ownership and the filing of this Form 3 shall not be construed as an admission that FP II Cayman is a beneficial owner of the Common Shares owned by Arsenal I.
( 5)	(Continued from footnote 4) Except to the extent of its interests as general partner in FP II Cayman, FP GP II Cayman expressly disclaims such beneficial ownership and the filing of this Form 3 shall not be construed as an admission that FP GP II Cayman is a beneficial owner of the Common Shares owned by Arsenal I. Except to the extent of its interests as general partner in FP GP II Cayman, FP Management Cayman expressly disclaims such beneficial ownership and the filing of this Form 3 shall not be construed as an admission that FP Management Cayman is a beneficial owner of the Common Shares owned by Arsenal I.
( 6)	Francisco Partners Parallel Fund II, L.P. ("FP Parallel Fund"), as the controlling member of Arsenal II, Francisco Partners GP II, L.P. ("FP GP II"), as the general partner of FP Parallel Fund, and Francisco Partners GP II Management, LLC ("FP Management"), as the general partner of FP GP II, may also be deemed to share voting and investment power of the Common Shares beneficially owned by Arsenal II.
( 7)	(Continued from footnote 6) Except to the extent of its interests as the controlling member of Arsenal II, FP Parallel Fund expressly disclaims such beneficial ownership and the filing of this Form 3 shall not be construed as an admission that FP Parallel Fund is a beneficial owner of the Common Shares owned by Arsenal II. Except to the extent of its interests as general partner in FP Parallel Fund, FP GP II expressly disclaims such beneficial ownership and the filing of this Form 3 shall not be construed as an admission that FP GP II is a beneficial owner of the Common Shares owned by Arsenal II. Except to the extent of its interest as general partner in FP GP II, FP Management expressly disclaims such beneficial ownership and the filing of this Form 3 shall not be construed as an admission that FP GP II is a beneficial owner of the Common Shares owned by Arsenal II.
( 8)	Represents 10,000 Common Shares of the Company underlying 10,000 Restricted Stock Units ("RSUs") granted to Francisco Partners on March 4, 2016. The RSUs are scheduled to vest on February 28, 2017.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
BALL BENJAMIN ONE LETTERMAN DRIVE, BUILDING C - SUITE SAN FRANCISCO, CA 94129	X

Signatures
/s/ Benjamin Ball		12/29/2016
^** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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