Exhibit 12.1

CALCULATION OF RATIOS OF EARNINGS TO FIXED CHARGES

PAETEC Holding’s ratios of earnings to fixed charges were as follows:

	Year Ended December 31,													Three Months Ended March  31,
	2006		2007		2008			2009			2010			2011
Earnings:
Income (loss) before income taxes	$	16,233	$	18,565	$	(398,098	)	$	(30,043	)	$	(58,745	)	$	(11,280	)
Plus: Fixed Charges (see below)		28,206		69,932		76,673			77,465			99,787			35,546
Total Earnings	$	44,439	$	88,497	$	(321,425	)	$	47,422		$	41,042		$	24,266
Fixed Charges:
Interest expense, including amortization of debt issuance costs, debt discounts, and debt premiums		27,319		68,373		73,663			74,149			96,339			34,464
Portion of rental expense deemed to represent interest		887		1,559		3,010			3,316			3,448			1,082
Total Fixed Charges		28,206		69,932		76,673			77,465			99,787			35,546
Ratio of earnings to fixed charges		1.58		1.27		*			*			*			*
Coverage deficiency	$	—	$	—	$	(398,098	)	$	(30,043	)	$	(58,745	)	$	(11,280	)

* There were insufficient earnings available to cover fixed charges for the years ended December 31, 2008, 2009 and 2010 and for the three months ended March 31, 2011. As a result, the ratio of earnings to fixed charges was less than 1.0 for each of such periods.