Exhibit 31.1

CERTIFICATION

I, Joseph W. McGrath, certify that:

1. I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K of Unisys Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Date: April 29, 2008
/s/ Joseph W. McGrath
Name:	Joseph W. McGrath
Title:	President and Chief Executive Officer