Document:

Exhibit 4.5.4

 Exhibit 4.5.4 
 THIRD SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of December 18, 2009, among PAETEC
Holding Corp., a Delaware corporation (the “Company”), and Allworx Corp., a Delaware corporation, MPX, Inc., a Delaware corporation, and Technology Resource Solutions, Inc., a New York corporation, each a subsidiary of the Company
(collectively, the “New Guarantors”), and The Bank of New York Mellon, as trustee under the indenture referred to below (the “Trustee”); 
 RECITALS 
 WHEREAS, the Company and certain of its Subsidiary
Guarantors have heretofore executed and delivered to the Trustee an Indenture, dated as of July 10, 2007 (as amended by the First Supplemental Indenture and the Second Supplemental Indenture referred to below, the “Indenture”),
providing for the issuance of an aggregate principal amount of $300 million of the Company’s 9.5% Senior Notes due 2015 (the “Notes”) and Subsidiary Guarantees of the Notes by the Subsidiary Guarantors, and the Company and
other Subsidiary Guarantors have heretofore executed and delivered to the Trustee a First Supplemental Indenture, dated as of September 25, 2007 (the “First Supplemental Indenture”), and a Second Supplemental Indenture, dated
as of February 8, 2008 (the “Second Supplemental Indenture”), each providing for Subsidiary Guarantees of the Notes by the Subsidiaries party thereto; 
 WHEREAS, Section 4.19 and Section 10.03 of the Indenture provide that the Company is required to use
commercially reasonable efforts to cause its current and future Restricted Subsidiaries that are eligible to be Subsidiary Guarantors under the definition thereof in the Indenture to execute and deliver to the Trustee a supplemental indenture
pursuant to which such Restricted Subsidiaries shall, jointly and severally with the other Subsidiary Guarantors, fully and unconditionally guarantee the payment and performance of the Notes and the other obligations set forth in
Section 10.01 of the Indenture, subject to Article Ten of the Indenture; 
 WHEREAS, the New
Guarantors are Restricted Subsidiaries and are eligible to guarantee the Notes; 
 WHEREAS, this Supplemental Indenture
executed pursuant to Section 4.19 and Section 10.03 of the Indenture shall evidence the Subsidiary Guarantees of the New Guarantors set forth in Section 10.01 of the Indenture; and 
 WHEREAS, pursuant to Section 4.19, Section 9.01 and Section 10.03 of the Indenture, the Trustee,
the Company and the New Guarantors are authorized or permitted to execute and deliver this Supplemental Indenture and the New Guarantors are authorized or permitted to execute and deliver the Subsidiary Guarantees; 

 NOW, THEREFORE, in consideration of the foregoing and for other good and valuable
consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 
 1. Capitalized Terms. Capitalized terms used in this Supplemental Indenture (including the recitals hereto) without definition shall
have the meanings set forth in the Indenture. 
 2. Agreement to Guarantee. Subject to Article Ten of the
Indenture, each New Guarantor hereby agrees, jointly and severally with the other Subsidiary Guarantors, to guarantee fully and unconditionally to each Holder of a Note and to the Trustee and its successors and assigns the payment and performance of
the Notes and the other obligations set forth in Section 10.01 of the Indenture and to be bound by all other applicable provisions of the Indenture and the Notes. Each New Guarantor acknowledges and agrees, pursuant to
Section 10.03 of the Indenture, that, upon its execution and delivery of this Supplemental Indenture, such New Guarantor shall be deemed to be a Subsidiary Guarantor for all purposes of the Indenture (including, without limitation, for
purposes of Article Ten thereof). 
 3. Ratification of Indenture; Supplemental Indenture Part of Indenture.
Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture
for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. 
 4.
Trustee’s Disclaimer. The Trustee makes no representation or warranty as to the validity or sufficiency of this Supplemental Indenture. The recitals and the statements herein are deemed to be those of the Company and the New Guarantors
and not of the Trustee. 
 5. Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY THE LAWS OF THE STATE OF
NEW YORK. THE COMPANY, THE NEW GUARANTORS AND THE TRUSTEE AGREE TO SUBMIT TO THE JURISDICTION OF THE COURTS OF THE STATE OF NEW YORK IN ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE. 
 6. Successors. All agreements of the New Guarantors in this Supplemental Indenture shall bind their respective successors.

 7. Counterparts. This Supplemental Indenture may be executed in two or more counterparts, all of which shall be
considered one and the same agreement. 
 8. Effect of Headings. The Section headings herein are for convenience only and
shall not affect the construction of any terms or provisions hereof. 
  

 2 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be
duly executed as of the date first written above. 
  

			
	THE NEW GUARANTORS
	
	ALLWORX CORP.
		
	By:	 	 /s/    Mary K. O’Connell

		 	 Name: Mary K. O’Connell
 Title: Vice President and Secretary

	
	MPX, INC.
		
	By:	 	 /s/    Mary K. O’Connell 

		 	 Name: Mary K. O’Connell
 Title: Vice President and Secretary

	
	TECHNOLOGY RESOURCES SOLUTIONS, INC.
		
	By:	 	 /s/    Mary K. O’Connell

		 	 Name: Mary K. O’Connell
 Title: Vice President and Secretary

 [Signature Page to Third Supplemental Indenture]

			
	THE COMPANY
	
	PAETEC HOLDING CORP.
		
	By:	 	 /s/    Mary K. O’Connell

		 	Name: Mary K. O’Connell
		 	Title: Senior Vice President, General
		 	          Counsel and Secretary

 [Signature Page to Third Supplemental Indenture] 

					
	THE BANK OF NEW YORK MELLON, as
	 Trustee

		
	 By:
	 	 /s/    Cheryl L. Clarke

		 	 Name: Cheryl L. Clarke

		 	 Title: Vice President

 [Signature Page to Third Supplemental Indenture]Exhibit 4.6.4

 Exhibit 4.6.4 
 SECOND SUPPLEMENTAL INDENTURE 
 SECOND SUPPLEMENTAL
INDENTURE (this “Supplemental Indenture”) dated as of March 5, 2010, among PAETEC Holding Corp., a Delaware corporation (the “Issuer”) and PAETEC Realty LLC, a New York limited liability company (the
“New Guarantor”) and a subsidiary of the Issuer, and The Bank of New York Mellon, as trustee under the indenture referred to below (the “Trustee”). 
 RECITALS 
 WHEREAS, the Issuer and certain of
its Subsidiary Guarantors have heretofore executed and delivered to the Trustee an Indenture, dated as of June 29, 2009 (as supplemented by that certain First Supplemental Indenture, dated as of January 12, 2010, referred to below, the
“Indenture”), providing for an initial issuance of an aggregate principal amount of $350,000,000 of the Issuer’s 8 7/8% Senior Secured Notes due 2017 (the “Notes”) on June 29, 2009 and an additional
issuance of an aggregate principal amount of $300,000,000 of the Notes on January 12, 2010 and Subsidiary Guarantees of the Notes by the Subsidiary Guarantors; 
 WHEREAS, Sections 4.19 and 10.03 of the Indenture provide that the Issuer is required to use commercially reasonable efforts to cause its current and future Restricted Subsidiaries
that are eligible to be Subsidiary Guarantors under the definition thereof in the Indenture to execute and deliver to the Trustee a supplemental indenture pursuant to which such Restricted Subsidiaries shall, jointly and severally with the other
Subsidiary Guarantors, fully and unconditionally guarantee the payment and performance of the Notes and the other obligations set forth in Section 10.01 of the Indenture, subject to Article Ten of the Indenture; 
 WHEREAS, the New Guarantor is a Restricted Subsidiary and is eligible to guarantee the Notes; 
 WHEREAS, this Supplemental Indenture executed pursuant to Sections 4.19 and 10.03 of the Indenture shall evidence the
Subsidiary Guarantee of the New Guarantor set forth in Section 10.01 of the Indenture; 
 WHEREAS, pursuant
to Section 4.19, Section 9.01 and Section 10.03 of the Indenture, the Trustee, the Issuer and the New Guarantor are authorized to execute and deliver this Supplemental Indenture and the New Guarantor is authorized
to execute and deliver the Subsidiary Guarantee; 
 NOW THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 
 1. Capitalized Terms. Capitalized terms used in this Supplemental Indenture (including the recitals hereto) without definition shall
have the meanings set forth in the Indenture. 
 2. Agreement to Guarantee. Subject to Article Ten of the
Indenture, the New Guarantor hereby agrees, jointly and severally with the other Subsidiary Guarantors, to guarantee fully and unconditionally to each Holder of a Note and to the Trustee and its successors and assigns the payment and performance of
the Notes and the other obligations set forth in Section 10.01 of the Indenture and to be bound by all other applicable provisions of the Indenture and the Notes. The New Guarantor acknowledges and agrees, pursuant to
Section 10.03 of the Indenture, that, upon its execution and delivery of this Supplemental Indenture, the New Guarantor shall be deemed to be a Subsidiary Guarantor for all purposes of the Indenture (including, without limitation, for
purposes of Article Ten thereof). 

 3. Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as
expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all
purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. 
 4.
Trustee’s Disclaimer. The Trustee makes no representation or warranty as to the validity or sufficiency of this Supplemental Indenture. The recitals and the statements herein are deemed to be those of the Issuer and the New Guarantor and
not of the Trustee. 
 5. Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY THE LAWS OF THE STATE
OF NEW YORK. THE ISSUER, THE NEW GUARANTOR AND THE TRUSTEE AGREE TO SUBMIT TO THE JURISDICTION OF THE COURTS OF THE STATE OF NEW YORK IN ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS SECOND SUPPLEMENTAL INDENTURE. 
 6. Successors. All agreements of the New Guarantor in this Supplemental Indenture shall bind its successors. 
 7. Counterparts. This Supplemental Indenture may be executed in two or more counterparts, all of which shall be considered one and
the same agreement. 
 8. Effect of Headings. The Section headings herein are for convenience only and shall not affect
the construction thereof. 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed as of the date first written above. 
  

			
	The New Guarantor
	
	PAETEC Realty LLC
		
	By:	 	 /s/    Mary K. O’Connell

	Name:	 	Mary K. O’Connell
	Title:	 	Senior Vice President, General Counsel and Secretary
	
	The Issuer
	
	PAETEC Holding Corp.
		
	By:	 	 /s/    Mary K. O’Connell

	Name:	 	Mary K. O’Connell
	Title:	 	Senior Vice President, General Counsel and Secretary

 [Second Supplemental Indenture] 

			
	The Trustee
	
	The Bank of New York Mellon
		
	By:	 	 /s/    Cheryl L. Clarke

	Name:	 	Cheryl L. Clarke
	Title:	 	Vice President

 [Second Supplemental
Indenture]

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