ALLIED WORLD ASSURANCE CO HOLDINGS LTD
EX-10.1: LETTER AGREEMENT
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<DESCRIPTION>EX-10.1: LETTER AGREEMENT
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<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><FONT style="font-variant: SMALL-CAPS">&#091;ALLIED WORLD ASSURANCE COMPANY, LTD LETTERHEAD&#093;</FONT>
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<DIV align="left" style="font-size: 10pt; margin-top: 12pt">February&nbsp;26, 2007
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>VIA FACSIMILE</B><BR>
<U><B>(973)&nbsp;535-0752; (973)&nbsp;533-2520</B></U>
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt">AIG Technologies, Inc.<BR>
2 Peach Tree Hill Road<BR>
Livingston, New Jersey 07039<BR>
U.S.A.<BR>
Attention: Mr.&nbsp;Henry Hamilton

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<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Dear Mr.&nbsp;Hamilton:
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reference is made to the Master Services Agreement (the &#147;Agreement&#148;), effective as of May&nbsp;9,
2006, by and between Allied World Assurance Company, Ltd (&#147;Allied World&#148;) and AIG Technologies,
Inc. (&#147;AIGT&#148;). This letter will confirm the understanding and intent of Allied World and AIGT to
terminate the Agreement effective as of December&nbsp;18, 2006.
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Please confirm that the foregoing is in accordance with your understanding by countersigning
and returning this letter to Wayne Datz, Assistant General Counsel, by facsimile at (441)&nbsp;292-0055.
Should you have any questions, please contact me at (441)&nbsp;278-5526 or Wayne Datz at (441)
278-5547.
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 50%">Very truly yours,

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<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 50%">/s/ Michael Fullen

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<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 50%">Michael Fullen<BR>
Application Development and Support

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<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Accepted and agreed to<BR>
as of the date indicated below:
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt">AIG TECHNOLOGIES, INC.
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt">By: <U>/s/ Henry J. Hamilton</U><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U><BR>
Name: Henry J. Hamilton<BR>
Title: Chief Operating Officer<BR>
Date: February&nbsp;28, 2007

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