Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a statement on Schedule 13G and/or 13D (including any and all amendments thereto) with respect to Common Stock of NCR Corporation, and further agree that this Joint Filing Agreement shall be included as an Exhibit to such joint filings.

The undersigned further agree that each party hereto is responsible for the timely filing of such Statement on Schedule 13G and/or 13D and any amendments thereto, and for the accuracy and completeness of the information concerning such party contained therein; provided, however, that no party is responsible for the accuracy or completeness of the information concerning any other party, unless such party knows or has reason to believe that such information is inaccurate.

This Joint Filing Agreement may be signed in counterparts with the same effect as if the signature on each counterpart were upon the same instrument.

            IN WITNESS WHEREOF, the undersigned have executed this Agreement as of May 24, 2010.

GREENLIGHT CAPITAL, LLC

By: /s/DANIEL ROITMAN                                                                      

Daniel Roitman

Chief Operating Officer

GREENLIGHT CAPITAL, INC.

By: /s/DANIEL ROITMAN                                                                      

Daniel Roitman

Chief Operating Officer

DME MANAGEMENT GP, LLC

By: /s/DANIEL ROITMAN                                                                      

Daniel Roitman

Chief Operating Officer

DME ADVISORS, LP

By: DME Advisors GP, LLC,

its general partner

     By: /s/DANIEL ROITMAN                                                                      

     Daniel Roitman

     Chief Operating Officer

DME CAPITAL MANAGEMENT, LP

By: DME Advisors GP, LLC,

its general partner

     By: /s/DANIEL ROITMAN                                                                      

     Daniel Roitman

     Chief Operating Officer

DME ADVISORS GP, LLC

By: /s/DANIEL ROITMAN                                                                      

Daniel Roitman

Chief Operating Officer

/s/DANIEL ROITMAN

Daniel Roitman, on behalf of David Einhorn