Document:

Exhibit 4.5.11

 Exhibit 4.5.11 
 TENTH SUPPLEMENTAL INDENTURE 
 TENTH SUPPLEMENTAL INDENTURE (this
“Supplemental Indenture”) dated as of June 3, 2011, among PAETEC Holding Corp., a Delaware corporation (the “Issuer”), XETA Technologies, Inc., an Oklahoma corporation, and Pyramid Communication Services, Inc.,
a Texas corporation, each a subsidiary of the Issuer (each a “New Guarantor” and collectively, the “New Guarantors”), and The Bank of New York Mellon (formerly known as The Bank of New York), 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 July 10, 2007 (as supplemented by the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental Indenture, the Fifth Supplemental Indenture, the Sixth Supplemental
Indenture, the Seventh Supplemental Indenture, the Eighth Supplemental Indenture and the Ninth Supplemental Indenture referred to below, the “Indenture”), providing for an initial issuance of an aggregate principal amount of
$300,000,000 of the Issuer’s 9.5% Senior Notes due 2015 (the “Notes”) and Subsidiary Guarantees of the Notes by the Subsidiary Guarantors, and the Issuer 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”), a Second Supplemental Indenture, dated as of February 8, 2008 (the “Second Supplemental
Indenture”), a Third Supplemental Indenture, dated as of December 18, 2009 (the “Third Supplemental Indenture”), a Fourth Supplemental Indenture, dated as of April 23, 2010 (the “Fourth Supplemental
Indenture”), a Fifth Supplemental Indenture, dated as of June 22, 2010 (the “Fifth Supplemental Indenture”), a Sixth Supplemental Indenture, dated as of October 15, 2010 (the “Sixth Supplemental
Indenture”), a Seventh Supplemental Indenture, dated as of December 6, 2010 (the “Seventh Supplemental Indenture”),an Eighth Supplemental Indenture, dated as of December 6, 2010 (the “Eighth Supplemental
Indenture”) and a Ninth Supplemental Indenture, dated as of May 5, 2011 (the “Ninth Supplemental Indenture”), each providing for Subsidiary Guarantees of the Notes by the Subsidiaries party thereto; 

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 Guarantors are Restricted Subsidiaries and
are 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 Guarantors 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 Guarantors are authorized to execute and
deliver this Supplemental Indenture and each New Guarantor is authorized to execute and deliver the Subsidiary Guarantee; 

 WHEREAS, all acts and requirements necessary to make this Supplemental Indenture the
legal, valid and binding obligation of the Issuer and the New Guarantors have been done; 
 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 Issuer 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 ISSUER, 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 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. 
 9. Conflict with the Trust Indenture Act. If any provision of this Supplemental Indenture
limits, qualifies or conflicts with any provision of the Trust Indenture Act of 1939 (the “TIA”) that is required under the TIA to be part of and govern any provision of this Supplemental Indenture, the provision of the TIA shall
control. If any provision of this Supplemental Indenture modifies or excludes any provision of the TIA that may be so modified or excluded, the provision of the TIA shall be deemed to apply to the Indenture as so modified or to be excluded by this
Supplemental Indenture. 

 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
	
	XETA Technologies, Inc.
	Pyramid Communication Services, Inc.
		
	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:	 	Executive Vice President, General Counsel and Secretary

 
			
	The Trustee
	
	The Bank of New York Mellon
		
	By:	 	 /s/ Leslie Lockhart

	Name:	 	Leslie Lockhart
	Title:	 	Senior AssociateExhibit 4.6.10

 Exhibit 4.6.10 
 EIGHTH SUPPLEMENTAL INDENTURE 
 EIGHTH SUPPLEMENTAL INDENTURE (this
“Supplemental Indenture”) dated as of May 5, 2011 among PAETEC Holding Corp., a Delaware corporation (the “Issuer”) and Hera Corporation, an Oklahoma corporation (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, that certain Second
Supplemental Indenture, dated as of March 5, 2010, that certain Third Supplemental Indenture, dated as of April 23, 2010, that certain Fourth Supplemental Indenture, dated as of June 22, 2010, that certain Fifth Supplemental
Indenture, dated as of October 15, 2010, that certain Sixth Supplemental Indenture, dated as of December 6, 2010 and that certain Seventh Supplemental Indenture, dated as of December 6, 2010, 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; 

WHEREAS, all acts and requirements necessary to make this Supplemental Indenture the legal, valid and binding obligation of the
Issuer and the New Guarantor have been done; 
 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 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. 
 9. Conflict with the Trust Indenture Act. If any provision of this Supplemental Indenture
limits, qualifies or conflicts with any provision of the Trust Indenture Act of 1939 (the “TIA”) that is required under the TIA to be part of and govern any provision of this Supplemental Indenture, the provision of the TIA shall
control. If any provision of this Supplemental Indenture modifies or excludes any provision of the TIA that may be so modified or excluded, the provision of the TIA shall be deemed to apply to the Indenture as so modified or to be excluded by this
Supplemental Indenture. 

 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
	
	Hera Corporation
		
	By:	 	 /s/ Mary K. O’Connell

	Name:	 	 Mary K. O’Connell

	 Title:
	 	 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

 
			
	The Trustee
	
	The Bank of New York Mellon
		
	By:	 	 /s/ Leslie Lockhart

	Name:	 	 Leslie Lockhart

	 Title:
	 	 Senior Associate

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