Exhibit 99.1


[Fiserv Logo]



November 1, 2008




Mr. Jay Brown
MBIA Incorporated
113 King St.
Armonk, NY 10504

Re: Board Resignation

Dear Jay:

This letter shall serve as my resignation from the MBIA Board of Directors
effective on or about November 3, 2008. My decision to resign is related to the
demands of my role as CEO of Fiserv which are exacerbated by the current and
anticipated market conditions.

I have enjoyed my time on the board and impressed by your leadership in this
particularly challenging time in MBIAs history. I know the company will
ultimately be successful with you and the board leading the transformation.

Thank you for the opportunity to be part of the board and please wish my
colleagues and management all the best.

Very truly yours,

/s/ Jeffery Yabuki
------------------

Jeffery Yabuki



CC:  Claire Gaudiani
     Dan Kearney