Document:

Exhibit 4.5

                      [LETTERHEAD OF MITEL SEMICONDUCTOR]

Mr AP Gallagher
23 Keyneston Road
Nythe
Swindon
Wilts

Dear Tony

Further to recent discussions I am pleased to offer you on behalf of Mitel
Semiconductor, the position of Divisional Vice President - MSL reporting to
Francois Cordeau VP Mitel Semiconductors with effect from 01 April 1999. The
base salary for this position is (pound)96,000.00 (ninety-six thousand pounds
only) per annum.

You will be eligible to participate in the Mitel Management Bonus plan for FY00,
and subject to the Company attaining the agreed budgets and you reaching your
own performance targets, your bonus payment will be 25% of your salary. Full
details of the scheme will be communicated to you shortly.

The main roles and responsibilities of this position are as discussed and as
defined in the attached job description.

This appointment is subject to nine months of termination by either side.

All other terms and conditions of employment remain unaltered.

I hope you find the contents of this letter satisfactory. If so please signify
your acceptance of the terms detailed in this letter by signing and dating the
enclosed copy of this letter and returning it to me as soon as possible.

Yours sincerely,

/s/ Gary Skakle
---------------
Gary Skakle
Worldwide Head of HR
Mitel Semiconductor

Signed /s/ A P Gallagher                  Dated          7 April `99
       -----------------                                 -----------

Name (Block Capitals) ______________________________________________

<PAGE>

                        Job Description

Job Title               Executive Director MSL

Reports to              Francios Cordeau

Location                Swindon

Main Purpose of Role    To co-ordinate, in a matrixed organisation the
                        activities of the Mitel Semiconductor Limited group of
                        Companies.

Key Tasks and
 Responsibilities

                        1.    Perform legal and statutory requirement duties as
                              Managing Director, Mitel Semiconductor Limited (
                              MSL )

                        2.    Maximise Profit & Loss performance within the MSL
                              legal entity in the UK and the MSL group of
                              companies by co-ordinating the activities of the
                              MSL senior management team ( SMT )

                        3.    In conjunction with Mitel Corporation senior
                              executive staff maximise cash generation within
                              MSL and associated group of companies

                        4.    Maintain day to day management of the MSL
                              organisation

                        5.    In conjunction the with VPs of Mitel Semiconductor
                              group, develop, lead and motivate the MSL SMT to
                              meet the high levels of performance required by
                              the Corporation

                        6.    In conjunction with VPs of Sales and VP of Finance
                              develop and implement strategies across the MSL
                              group of companies to improve customer service and
                              market penetration in line with corporate goals
                              and objectives

                        7.    Develop, implement and monitor appropriate
                              strategies and policies that meet the overall
                              Mitel Corporation goals and objectives.

                        8.    Liaise with all Mitel Semiconductor VPs to ensure
                              that strategies for the continued growth of the
                              business are co-ordinated and that all synergies
                              are exploited

                        9.    Develop, and implement effective communication
                              strategies to ensure that all employees including
                              senior management, customers and stakeholders are
                              fully aware of strategies and company wide issues,
                              as appropriate

                        10.   Assume responsibility for MSL site management
                              including space, health and safety, environmental
                              engineering, security and Y2K

<PAGE>

                        11.   Chair MSL senior management team meeting and
                              report to VP Mitel Semiconductors group on all MSL
                              business

                        12.   Initially assume the line responsibility for
                              central and local planning groups until
                              reorganisation of the process is complete.

Thos job description outlines the main tasks and responsibilities to be
undertaken by the incumbent. It is not an exhaustive list and the description
may be altered at any time to reflect the strategies, objectives and goals of
the organisation.

<PAGE>

                           [LETTERHEAD OF GEC PLESSEY]

Mr A Gallagher
23 Keyneston Road
Nythe
Swindon
Wiltshire

26 May 1992

Dear Tony

Further to our recent discussions, I am now pleased to formally offer you the
position of Finance Director, GEC Plessey Semiconductors, reporting to the
Managing Director, Mr D J Dunn.

You will be paid a salary of (pound)61,000 (sixty-one thousand pounds) per
annum, which will be next reviewed on 1 July 1993 and annually thereafter.

Health Insurance

You and your family will be able to join our Health Insurance Scheme, for senior
staff, details of which are attached.

Provision of Car

You will be given the exclusive use of a company car. All such vehicles are
subject to prevailing company regulations. Your benchmark model will be a
Vauxhall Senator 3.0i CD. If you wish to select an alternative model of
equivalent value please discuss your proposal with me. However, will you please
be aware that alternative models may only be selected from the Rover, Ford or
Vauxhall range of cars. You will be reimbursed all business mileage. Private
mileage, however, is your responsibility.

Travel

You will be entitled to travel first class by rail. Air travel is arranged by
the most economic suitable method depending on the destination and duration of
the flight.

Notice Period

The notice period, from either party, will be twenty-six weeks in the event of
termination of your employment.

GEC Managers' Share Option Scheme

You will be eligible for participation in this scheme when the next tranche of
Managers' Share Options are issued.

                                                                     cont'd/....

<PAGE>

Hours of Work

Your hours of work will be those necessary for the proper performance of your
duties, but in any event will not be less than 37.5 hours per week.

Holidays

Your annual leave entitlement is 25 days annual holiday plus public holidays.
The holiday year runs from 1 April to the following 31 March.

Pension

You will be able to join the GEC Plan and Selected Benefit Scheme, details of
which are attached.

Duty of Confidence

The Company has established policies to protect its proprietary and confidential
information. This safe-guarding of the future prosperity of the Company is in
every employee's interest. Acceptance of the terms of this letter will include
acceptance of these policies.

Company Document, Software and Equipment

All the following are the sole property of the Company and you should return
them to the Company at any time on request and in the event of the termination
of your employment:-

-     all books, papers, records, returns, drawings, notes, data, blueprints,
      instructions, customer and price lists and information, correspondence and
      other documents - and all copies of them or extracts from them relating to
      the Company's business.
-     together with any software, magnetic or other storage media, and
-     any of the Company's tools and equipment.

I hope to receive a favourable response from you. However, if you have any
questions please do not hesitate to call me.

Yours sincerely

/s/ Tim Jones
-------------
TIM JONES
PERSONNEL DIRECTOR

enc

<PAGE>

Attachment to Letter of Appointment : Mr A Gallagher
26 May 1992

I accept the position of Finance Director, GEC Plessey Semiconductors, on the
terms stated in this letter.

Signed /s/ A Gallagher                   Dated 31/5/1992
       ---------------                         ---------January 12, 2000

To: Don McIntyre
    Sr. Vice-President, HR, General Counsel and Secretary

From: Jonathan Wener
      Chairman of the
      Compensation Committee

New Executive Termination Arrangements

      The Board of Directors has approved new executive termination arrangements
effective immediately. These arrangements will cover your involuntary
termination of employment with Mitel Corporation in any circumstance that is
considered to be termination "without good legal cause" as that term has been
interpreted by the Courts of the Province of Ontario from time to time. This
will replace both the VP Termination Policy which had previously applied to your
termination of employment in the ordinary course of business and the termination
provisions of the Compensation Agreement dated the 14th of May, 1996 which
applied in the special circumstance of termination in the event of a Change of
Control as defined in that document.

      Upon your involuntary termination from employment with Mitel Corporation
without good legal cause, you will be provided the following termination package
(net of required deductions):

      A/    payment in a lump sum of an amount equal to two (2) times your
            annual base salary and annual target bonus. (the target bonus does
            not include any special project bonus arrangements). This payment
            will be made within 30 business days following the date of
            termination;

      B/    payment of two (2) years regular annual contributions to the
            Executive Pension Plan ( Deferred Contribution Pension Plan and
            Supplemental Retirement Plan) paid annually with the first payment
            within 30 business days following the date of termination and the
            second payment, subject to subsection F, on the first anniversary of
            the date of termination;

      C/    provision of two (2) years of continuous group life and health
            benefits coverage (long term disability coverage is not included
            unless the insurance carrier is willing to provide this coverage);

      D/    you will have the period of 6 months following the date of
            termination to exercise all Mitel stock options that are vested up
            to the end of the exercise period;

      E/    all perquisites such as company cars, club memberships and the like
            will cease 30 days following termination;

      F/    the Executive Pension Plan contributions and group life and health
            coverage will terminate earlier if you become re-employed or become
            established as self-employed at a substantially similar level of
            compensation. These will terminate effective 30 days following
            confirmation of such status;

      G/    the termination package payments will be limited to a
            proportionately lesser amount than as set out herein if the period
            from termination to age 65 is less than two (2) years;

      H/    in accepting these termination provisions, you acknowledge that the
            sale contemplated under PROJECTS OPUS and DUO will not in itself
            constitute sufficient grounds for alleging constructive dismissal.

<PAGE>

      In consideration for granting this new termination package, the Board
requires that, for a period of one year from your date of termination of
employment with Mitel, you will not participate (as an employee, executive,
director or significant investor (greater than 20%)) in any business operating
anywhere in the world that competes directly with the principal businesses of
Mitel (or its successor) and you will not directly or indirectly solicit any of
Mitel's customers for business in competition with Mitel (or its successor) or
solicit, entice, approach or induce any of Mitel's employees to leave their
employment with Mitel (or its successor) or to join another business or
organization.

Mitel Board of Directors

Per:  Jonathan Wener
      Chairman of the
      Compensation Committee

I accept the new employment termination terms and conditions and agree that they
replace any prior arrangements. I further agree with the terms of
non-competition and non-solicitation outlined in this memo. I agree that the
length of period and worldwide scope of these restrictions are fair and
reasonable in the circumstances.

/s/Don McIntyre       March 7, 2000
---------------       -------------
Don McIntyre           Date

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00086-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00086-of-00352.parquet"}]]