Exhibit 12.1

CALCULATION OF RATIOS OF EARNINGS TO FIXED CHARGES

PAETEC Holding’s ratios of earnings to fixed charges for the fiscal periods shown below were as follows:

	Year Ended December 31,												Three Months Ended March 31,
	2005		2006		2007		2008			2009			2009			2010
	(in thousands)
Earnings:
Income (loss) before income taxes	$	28,598	$	16,233	$	18,565	$	(398,098	)	$	(30,043	)	$	(2,553	)	$	(10,479	)
Plus: Fixed Charges (see below)		11,374		28,206		69,932		76,673			77,465			18,063			22,876
Total Earnings	$	39,972	$	44,439	$	88,497	$	(321,425	)	$	47,422		$	15,510		$	12,397
Fixed Charges:
Interest expense, including amortization of debt issuance costs, debt discounts, and debt premiums	$	10,472	$	27,319	$	68,373	$	73,663		$	74,149		$	17,224		$	22,037
Portion of rental expense deemed to represent interest		902		887		1,559		3,010			3,316			839			839
Total Fixed Charges	$	11,374	$	28,206	$	69,932	$	76,673		$	77,465		$	18,063		$	22,876
Ratio of earnings to fixed charges		3.51		1.58		1.27		*			*			*			*
Coverage deficiency	$	—	$	—	$	—	$	(398,098	)	$	(30,043	)	$	(2,553	)	$	(10,479	)

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