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                          Mentor Graphics Corporation
                (Name of Registrant as Specified In Its Charter)

                               Icahn Partners LP
                         Icahn Partners Master Fund LP
                        Icahn Partners Master Fund II LP
                       Icahn Partners Master Fund III LP
                         High River Limited Partnership
                             Hopper Investments LLC
                                 Barberry Corp.
                                Icahn Onshore LP
                               Icahn Offshore LP
                               Icahn Capital L.P.
                                   IPH GP LLC
                        Icahn Enterprises Holdings L.P.
                          Icahn Enterprises G.P. Inc.
                                 Beckton Corp.
                                 Carl C. Icahn
                                  Brett Icahn
                                David Schechter
                                  Gary Meyers
                               Jose Maria Alapont
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                             FOR IMMEDIATE RELEASE

          ICAHN ISSUES OPEN LETTER TO SHAREHOLDERS OF MENTOR GRAPHICS

New York, New York, April 21, 2011
Contact: Susan Gordon (212) 702-4309

Carl  C.  Icahn today issued the following open letter to shareholders of Mentor
Graphics  Corporation:



                                 CARL C. ICAHN
                          767 Fifth Avenue, 47th Floor
                            New York, New York 10153

     April  21,  2011

Dear  Fellow  Shareholders:

It  is  time  for a change on the Board of Directors of Mentor Graphics. For the
first  time,  shareholders  of  Mentor  Graphics  are  being  presented  with an
opportunity  to  elect  directors  not  nominated by the entrenched Board. Eight
years have passed without a single director joining or leaving. All three of the
directors  we  seek  to  replace  have  been on the Board since 1994, just after
Walden  Rhines  became  CEO. One of the directors we seek to replace is actually
the  lead independent director, despite spending over 17 years on the Board with
the CEO and the President. Mentor's stock is now at approximately the same level
as  it  was  in  1994  while  CEO  Walden  Rhines  received  $65  million  in
compensation.(i)  This  Board  has  failed  to  hold  management  accountable to
shareholders  in  our  opinion.  Shareholders  can  send a strong signal to this
entrenched  Board  by  electing  our  three  nominees.

Our  plan  is  not  limited  to  a  sale of the Company. We have a clear plan to
improve  earnings  per  share  through improved oversight in two key areas where
over  the  past  17 years this Board has allowed for a bloated expense structure
and  massive  share  dilution:

      (1) SG&A GROWTH IN EXCESS OF TOTAL REVENUE GROWTH; AND (2) DILUTION.

Since  1994,  Mentor's  annualized  revenue growth was 5.3% while its annualized
SG&A  growth  was  5.7%.  This has led SG&A as a percentage of Total Revenues to
increase  to  46%.  This  is  quite  unfortunate  for shareholders, as with 5.3%
annualized  revenue  growth  it  seems absurd to us that Mentor could not better
leverage  its  SG&A  expenses.

                                                           FY  1994     FY  2011
                                                           --------     --------
Total Revenues                                               $390MM     $915MM

Marketing and Selling                                        $129MM     $321MM
General and Administration                                    $40MM     $100MM
Total SG&A Expenses                                          $169MM     $421MM

ANNUALIZED REVENUE GROWTH                                                5.3%
ANNUALIZED SG&A GROWTH                                                   5.7%
SG&A % OF TOTAL REVENUES                                        43%       46%

Even  today,  Mentor's  SG&A as a percentage of Revenues is significantly higher
than  its closest peers. We believe that Cadence's ratio of SG&A as a percentage
of  Revenues  would  be  lower  if  it was not still undergoing the effects of a
transition  from  a  term based model to a ratable model that temporarily lowers
revenues.  Even  Magma  Design  Automation, a competitor of Mentor Graphics with
just  $135M  of  Revenues, has roughly the same ratio of SG&A as a percentage of
Revenues.




LTM(ii)                       MENTOR     SYNOPSYS     CADENCE
-------                       ------     --------     -------
Total Revenues                $915MM     $1,415MM     $936MM
SG&A                          $421MM       $458MM     $392MM
SG&A AS A % OF REVENUES        46.0%        32.4%      41.9%

This simple analysis is a clear warning sign. Mentor has grown SG&A at a rate in
excess  of  its  5.3%  revenue  growth and its SG&A relative to its revenues are
significantly  higher than its peers. Often it is difficult for public companies
across  our country to control growth in SG&A for a variety of reasons. The fact
that  the  CEO  has  been  with  the  Company for 18 years may make it even more
difficult.  While  we  believe  a  board  should  not  micro-manage,  in certain
instances  where there are clear warning signs, a board needs to take action. At
Icahn  controlled companies or those where we have a strong minority position on
the board, if presented with similar facts, we would move to form a committee of
the board to assess the situation in further detail, possibly engaging a leading
consulting  firm to advise the board and also work cooperatively with management
in  order to determine how to improve efficiency in the Company's SG&A spend. We
have  set  up  an organization to develop methodologies and controls to leverage
best  practices  and  make  them  available  to  portfolio companies and use the
collective  scale  of  these  companies  to negotiate improvements in rates on a
variety  of products and services from third parties. This cost control has been
an  important factor in the success of the companies where we have been involved
over the years. We believe the collective impact of this effort will result in a
reduction  in SG&A expenses without affecting the revenue growth of the Company.
One  of  our nominees, David Schechter, as an employee of Carl Icahn since 2004,
has  served  on the board of directors of several of the companies controlled by
Carl Icahn and is well versed and has been involved in employing methods that we
have  used  successfully  to  "cost  control"  without affecting revenue growth.

Mentor's Board has persistently diluted its shareholders while its closest peers
have  not.  The  table  below highlights the magnitude of this dilution over the
past  eight years. During this timeframe not a single director was added or left
the  Board  of  Mentor  Graphics.

BASIC SHARES OUTSTANDING      MENTOR     SYNOPSYS     CADENCE
------------------------      ------     --------     -------
Shares - 1/1/04               68.3MM      156.6MM     268.4MM
Shares - 3/31/11             112.3MM      150.9MM     268.6MM
% INCREASE                     64.4%        -3.6%        0.1%

This  SG&A growth in excess of revenue growth and dilution are indicative of the
Company's  performance  since  1994.  Over  that timeframe the Company generated
negative  $336MM  of  cumulative  cash  flow  from  operations  less  capital
expenditures  and  cash  acquisitions.

Selling  the  Company is not our only plan. Our nominees have two plans that are
not  mutually  exclusive.  Plan  A  is  to  explore  a  sale of the Company to a
strategic  buyer. Plan B is to hold management accountable to lower the ratio of
SG&A  as  a percentage of Total Revenues (to be more in line with its peers) and
to  use  its cash flow to buy back its stock. Our Plan B could have a meaningful
benefit  to  earnings  per  share  growth.

If  the  Company  had  identified  just  $20MM of SG&A reductions that would not
impact  the  top  line  and  implemented them prior to its FY 2012, then its EPS
guidance  would  have  been  15%  higher(iii)  than the $1.00 per share non-GAAP
guidance  it provided. Keep in mind that even with this reduction, Mentor's SG&A
as  a  percentage  of Total Revenues would still be higher than both its leading
peers.

If  the  Company  uses  its  cash  flow going forward to buy back stock, it will
reduce  the  share count and thereby further improve EPS. Assuming net income is
equal  to  cash  flow,  if Mentor used all its net income(iv) in the next fiscal
year  to repurchase stock, at a price of $14.01 the Company could repurchase 8MM
shares,  which  represents  7%  of  its  outstanding  shares.

Our nominees are highly qualified to serve on Mentor's Board and to advocate for
Plan  B.

 JOSE  MARIA  ALAPONT - WHY HIS BACKGROUND IS RELEVANT TO MENTOR AND OUR PLAN B?

Mentor  dedicated three pages of its Investor Presentation to its Transportation
Solutions  segment that is growing and represents 15% of its product bookings in
recent quarters. Jose Maria is CEO of Federal-Mogul Corporation, which generates
over  $6  billion  in revenues and shares many of the same customers that Mentor
targets  in  its  Transportation  Solutions  segment.  Jose  Maria  has  strong
relationships  in  this  industry that are unmatched by the directors we seek to
replace  and  can  clearly  offer  advice  to  management. Jose Maria has been a
visionary  in  terms  of  his  efforts  to  improve  the  cost  structure  at
Federal-Mogul.  As  CEO  he manages over 42,700 employees, a large multinational
customer  base,  numerous  plants  all over the world, and advanced technologies
throughout  its  products  set.  Jose  Maria  has  aggressively managed his cost
structure  while  continuing  to  invest heavily in R&D to successfully lead his
company through an extraordinarily difficult period for the automotive industry.
Jose  Maria  has  a clear track record of success as Federal-Mogul's stock price
has  risen  10x  from  its  low  in  2009.(v)

GARY  MEYERS  -  WHY  HIS  BACKGROUND  IS  RELEVANT  TO  MENTOR  AND OUR PLAN B?

Gary is uniquely qualified to evaluate Mentor's product portfolio and assess the
Company's  strategy.  This  knowledge  will  be instrumental in assessing how to
better manage SG&A. He recently left Synopsys in April 2010 where he served as a
senior  executive  after serving as CEO of Synplicity, a publicly traded peer to
Mentor Graphics, which was sold to Synopsys in 2008. Previously, Gary was a chip
designer  and  served  in  senior sales and marketing roles in the semiconductor
industry.  Gary  has  a clear track record of success as Synplicity was sold for
$223 million to Synopsys, a 50% premium relative to the last closing price prior
to  the  announcement  of the deal.(vi) Gary's industry expertise may assist the
Board  in assessing whether there are any inefficient "pet projects" that should
be  eliminated  or  scaled  back.

DAVID  SCHECHTER  -  WHY  HIS  BACKGROUND  IS RELEVANT TO MENTOR AND OUR PLAN B?

David  has  a  background  as  an investor in publicly traded companies that the
existing  Board  appears  to lack and currently serves as a Portfolio Manager of
the  Sargon  Portfolio  for  Icahn  Capital  (Mentor's  largest shareholder with
14.3%).  This  activist investment portfolio holds Mentor Graphics and therefore
David  is  highly incentivized to both limit the issuance of dilutive securities
and  offer  views  on  shareholder friendly activities that unlock value. Within
this portfolio, David serves as a board member of The Hain Celestial Group where
he  has  worked  cooperatively with the board and management and has led a large
investment  in  another  software company, Lawson Software, that has announced a
strategic  review  process.  David  has  a  clear track record of success as the
portfolio  he  co-manages generated an 80% return on its initial capital of $300
million  since  inception  on  4/1/10  through 3/31/11.(vii) In addition to this
strong  investment  record,  David  has  extensive  experience implementing cost
controls  at  companies controlled by Carl Icahn. At several of these companies,
David  has  served  as  director  and has engaged leading consulting firms which
collaborated  with  Icahn  Sourcing, Carl Icahn's organization for managing cost
efficiency  opportunities,  identifying  and eliminating unnecessary expenses to
improve  efficiencies  across  major  cost  centers.

All  three  of our nominees are highly qualified with transparent career success
from  a  scale, performance, and relevancy perspective. It is not clear to us if
any  of  the  three  directors we seek to replace could say the same about their
performance  in  their  last  job.(viii)  Don't  we  as shareholders deserve new
directors  with  strong backgrounds who can give a fresh perspective considering
the  actions the Board has taken and the fact that these three directors we seek
to replace have served for an average of 22 years? Two of our three nominees are
or have recently been CEOs of publicly traded companies with industry experience
directly  relevant to Mentor Graphics. We strongly encourage all shareholders to
look  at  the  collective background and performance of our nominees and compare
them  to  the  three  directors  we  seek  to  replace.

Look at the record on corporate governance in terms of a sale of the Company and
the treatment of shareholders. The CEO of Cadence wrote a letter in June 2008 to
Walden Rhines saying "over the last two months, we have sought to engage you and
your Board of Directors in discussions regarding our proposal to combine Cadence
Design  Systems, Inc. and Mentor Graphics Corporation. We are disappointed that,
despite  our  best  efforts,  you  have  thus far been unwilling to meaningfully
participate  in  such  discussion"  and  "you informed us that, even without any
substantive  discussion  with us or negotiation of our proposal, Mentor Graphics
concluded  that  it  did  not  wish  to  pursue discussions with us given Mentor
Graphics'  desire  to  stay  independent".  Shortly  after becoming aware of our
investment  in  Mentor,  the  Board  implemented  a  "poison  pill" to limit our
ownership  to 15%. The day after learning of another shareholder's investment in
the  Company  (Casablanca  Capital),  Mentor  announced  an  annual meeting date
several  months  in  advance  of  the  prior  year's  meeting,  thereby  leaving
shareholders just ten days to nominate directors (a strategy we believe was used
to  impede  the  nomination  of  directors by shareholders). The Board made this
decision  on  January 17th but didn't bother disclosing it to shareholders until
February  4th! After rejecting our offer to buy the Company for $17.00 per share
and  to  serve  as  a stalking horse (with no break up fees) so that the Company
could  seek  superior  offers,  this Board publicly named its "logical strategic
buyers" and detailed publicly in a presentation filed with the SEC why there may
be  regulatory  issues.  These series of events lead us to question this Board's
intent.

Look at the facts that we have presented on the Board's oversight of SG&A and on
dilution.  The  record  is  clear  as we highlighted earlier. Just one day after
rejecting our offer of $17.00 as undervalued, this Board, despite no urgency and
clear  alternatives  that  required no dilution, announced and priced a dilutive
convertible debt security. It took this Board seven days to publicly acknowledge
that  in  the  event  of  an acquisition of the Company for cash, the conversion
price  drops  to  a  price  far  below  the headline conversion price of $20.54.

Now  is  your  chance  for  a  change. Don't let yourself be susceptible to fear
mongering.  Our  nominees, if elected would collectively represent a minority of
the  Board with just three of eight seats. Therefore, change can occur only with
the  support  of  several  existing  directors.  We  are  confident in our plans
outlined to enhance value and the ability of our nominees to improve governance.
Mentor Graphics has tremendous assets developed through its world class research
and  development  organization,  and  we are confident in our investment and the
future  for  Mentor  Graphics  shareholders  if  our nominees are elected to the
Board.

Mentor  Graphics needs new ideas, new blood, and a new way of thinking. Over two
decades of entrenchment, this Board has lost the drive to perform. They have not
been  held accountable. As a result, they allowed the expenses of the Company to
grow year after year without the proper systems of control in place necessary to
maintain  efficiency.  They  have allowed for outsized share dilution year after
year  while the shareholders suffered. We believe our nominees can bring change.
We  are confident that if you vote for our nominees, shareholders will no longer
feel  compelled  to  go on television and call this Company a "country club." We
strongly  encourage  you  to  vote  the  GOLD  proxy  card.

                                   Sincerely  yours,


                                   CARL  C.  ICAHN





If you have any questions or require any assistance in executing your proxy,
please call:

                             D.F. King & Co., Inc.
                   Shareholders call tollfree: (800) 7143313
                 Banks and Brokerage Firms call: (212) 2695550


IMPORTANT  DISCLOSURES

These  materials are based solely on information contained in the public domain.
We have relied upon and assumed, have not attempted to independently investigate
or  verify, and do not assume any responsibility for, the accuracy, completeness
or reasonableness of such information. No representation or warranty, express or
implied,  is made as to the accuracy or completeness of any information included
or  otherwise  used  herein, and nothing contained herein is, or shall be relied
upon  as,  a  representation or warranty, whether as to the past, the present or
the  future. These materials are necessarily based upon information available to
us,  and financial, stock market and other existing conditions and circumstances
that  are  known  to  us,  as of the date of these materials. We do not have any
obligation  to  update  or  otherwise  revise  these  materials.

The information contained in these materials does not purport to be an appraisal
of  any  of  the assets or liabilities of Mentor Graphics or any of its business
units  or  subsidiaries,  or  any other companies mentioned herein, and does not
express any opinion as to the price at which the securities of any such entities
may  trade at any time. The information and opinions provided in these materials
take  no  account  of  any investor's individual circumstances and should not be
taken  as  specific  advice  on the merits of any investment decision. Moreover,
nothing  contained  herein  should  be  construed as providing any legal, tax or
accounting  advice,  and  you  are  encouraged  to consult with your legal, tax,
accounting  and investment advisors. You should consider these materials as only
one  of  many  factors  to  be  considered  in  making  any  investment or other
decisions.  We  do  not  accept  any  liability  whatsoever  for  any  direct or
consequential  loss  howsoever  arising, directly or indirectly, from any use of
these  materials.

ON  APRIL  1,  2011,  CARL  C. ICAHN AND AFFILIATES ("ICAHN") FILED A DEFINITIVE
PROXY  STATEMENT  WITH  THE  SECURITIES  AND  EXCHANGE COMMISSION (THE "SEC") IN
CONNECTION  WITH  THE  UPCOMING  2011  ANNUAL  MEETING OF SHAREHOLDERS OF MENTOR
GRAPHICS.  SHAREHOLDERS  ARE ADVISED TO READ ICAHN'S DEFINITIVE PROXY STATEMENT,
AND  ANY OTHER RELEVANT DOCUMENTS FILED BY ICAHN WITH THE SEC, BEFORE MAKING ANY
VOTING  OR  INVESTMENT  DECISION BECAUSE THEY CONTAIN IMPORTANT INFORMATION. THE
DEFINITIVE  PROXY  STATEMENT  IS,  AND  ANY  OTHER  RELEVANT DOCUMENTS AND OTHER
MATERIAL  FILED  BY  ICAHN WITH THE SEC CONCERNING MENTOR GRAPHICS WILL BE, WHEN
FILED,  AVAILABLE  FREE  OF  CHARGE  AT  HTTP://WWW.SEC.GOV  AND
WWW.READMATERIAL.COM/MENTOR.  IN  ADDITION, COPIES OF THE PROXY MATERIALS MAY BE
REQUESTED  FROM  ICAHN'S PROXY SOLICITOR, D.F. KING & CO., INC., BY TELEPHONE AT
(800) 714-3313.



___________________________
(i)  Walden  Rhines  received  $20MM in base and bonus/non-equity incentive plan
     compensation, along with 4.3MM options and shares worth $45MM applying SFAS
     123R methodology post 1/1/06 and the midpoint of potential realizable value
     at  assumed  annual rates of stock price appreciation for option term of 5%
     to  10%  prior to 1/1/06 and the closing share price on 12/31/93 for Mentor
     was  $13.75  versus  $14.01  on  4/18/11.

(ii) Last  twelve  month results as identified in the respective Company 10K and
     10Q.

(iii) $20MM expense reduction tax effected at a 17% non GAAP tax rate divided by
     the  112.3MM shares outstanding on the record date of 3/11/11 equates to an
     EPS  improvement  of  $0.15  per  share.

(iv) $112.3MM  which  equates  to  Company guidance of non-GAAP EPS of $1.00 per
     share  x  112.3MM  shares  outstanding  on  the  record  date  of  3/11/11.

(v)  Past  performance  is  no  indication  of  future  results.

(vi) Past  performance  is  no  indication  of  future  results.

(vii)  Past  performance  is  no  indication  of  future  results.

(viii)  Other  than  "industry  consultant"  or  "private  investor"  or  "board
     director."