Exhibit 12.1

CALCULATION OF RATIOS OF EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDENDS

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

	Year Ended December 31,											Nine Months Ended September 30,
	2002			2003		2004		2005		2006		2006		2007
								(in thousands)
Earnings:
Income (loss) before income taxes and cumulative effect of a change in accounting principle	$	(9,462	)	$	35,160	$	40,477	$	28,598	$	16,233	$	12,146	$	(6,846	)
Plus: Fixed Charges (see below)		15,265			11,289		11,703		11,376		28,207		17,814		52,155
Total Earnings	$	5,803		$	46,449	$	52,180	$	39,974	$	44,440	$	29,960	$	45,309
Fixed Charges:
Interest expense, including amortization of debt issuance costs		14,745			10,737		10,911		10,472		27,319		17,144		51,001
Portion of rental expense deemed to represent interest		520			552		792		904		888		670		1,154
Total Fixed Charges		15,265			11,289		11,703		11,376		28,207		17,814		52,155
Preferred dividends and accretion to redemption value		—			—		—		—		—		—		—
Total Fixed Charges and Preferred Dividends and Accretion	$	15,265		$	11,289	$	11,703	$	11,376	$	28,207	$	17,814	$	52,155
Ratio of earnings to fixed charges and preferred stock dividends		0.38			4.11		4.46		3.51		1.58		1.68		0.87
Coverage deficiency	$	(9,462	)		—		—		—		—		—	$	(6,846	)