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        <link:definition>101 - Document - Document and Entity Information</link:definition>
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        <link:definition>103 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
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        <link:definition>104 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
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        <link:definition>105 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</link:definition>
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        <link:definition>106 - Statement - CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIENCY) AND COMPREHENSIVE INCOME (LOSS)</link:definition>
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        <link:definition>107 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
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        <link:definition>108 - Disclosure - BACKGROUND AND NATURE OF OPERATIONS</link:definition>
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        <link:definition>109 - Disclosure - ACCOUNTING POLICIES</link:definition>
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        <link:definition>110 - Disclosure - ASSETS OF COMPONENT HELD FOR SALE AND DISCONTINUED OPERATIONS</link:definition>
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        <link:definition>111 - Disclosure - NET INVESTMENT IN SALES-TYPE LEASES</link:definition>
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        <link:definition>112 - Disclosure - INVENTORIES</link:definition>
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        <link:definition>113 - Disclosure - OTHER CURRENT ASSETS</link:definition>
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        <link:definition>114 - Disclosure - PROPERTY AND EQUIPMENT</link:definition>
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        <link:definition>115 - Disclosure - IDENTIFIABLE INTANGIBLE ASSETS</link:definition>
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        <link:definition>116 - Disclosure - GOODWILL</link:definition>
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        <link:definition>117 - Disclosure - ACCOUNTS PAYABLE AND ACCRUED LIABILITIES</link:definition>
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        <link:definition>118 - Disclosure - RELATED PARTY TRANSACTIONS</link:definition>
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        <link:definition>119 - Disclosure - LONG-TERM DEBT</link:definition>
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        <link:definition>120 - Disclosure - COMMITMENTS AND GUARANTEES</link:definition>
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        <link:definition>121 - Disclosure - CONTINGENCIES</link:definition>
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        <link:definition>122 - Disclosure - COMMON SHARES</link:definition>
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        <link:definition>123 - Disclosure - PREFERRED SHARES</link:definition>
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        <link:definition>124 - Disclosure - WARRANTS</link:definition>
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        <link:definition>125 - Disclosure - EARNINGS (LOSS) PER SHARE ("EPS")</link:definition>
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        <link:definition>126 - Disclosure - SPECIAL CHARGES AND RESTRUCTURING COSTS</link:definition>
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        <link:definition>127 - Disclosure - FAIR VALUE ADJUSTMENT ON DERIVATIVE INSTRUMENTS</link:definition>
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        <link:definition>128 - Disclosure - SUPPLEMENTARY CASH FLOW INFORMATION</link:definition>
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        <link:definition>129 - Disclosure - SEGMENT INFORMATION</link:definition>
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        <link:definition>130 - Disclosure - INCOME TAXES</link:definition>
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        <link:definition>131 - Disclosure - PENSION PLANS</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>132 - Disclosure - FOREIGN CURRENCY, CREDIT AND INTEREST RATE RISK</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.mitel.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock" id="Role_NotesToFinancialStatementsFairValueDisclosuresTextBlock">
        <link:definition>133 - Disclosure - FAIR VALUE MEASUREMENTS</link:definition>
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        <link:definition>134 - Disclosure - SCHEDULE II VALUATION OF QUALIFYING ACCOUNTS</link:definition>
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