Exhibit (a)(10)

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FORM OF ACKNOWLEDGEMENT OF RECEIPT OF ELECTION FORM

KLA-Tencor Corporation has received your Election Form dated Feb 26, 2007 PST, by which you made the following elections with respect to your Eligible Options:

Grant Date

November 13, 2000

November 13, 2000

December 27, 2001

April 10, 2002

February 21, 2004

December 17, 2004

Option Number

00034601

00034602

00037381

00039672

F02136

F02968

Option Plan

98

98

96

96

96

96

Exercise Price Per Share

13.38

13.38

15.29

12.21

9.31

7.66

Total Number of Shares Subject to Outstanding Option

7,551

449

24,100

4,500

4,500

5,000

Number of Shares Subject to Portion Qualifying as Eligible Option

7,551

449

24,100

2,925

1,350

1,562

Amend Entire Eligile Portion?

Y

N

N

N

N

Y

If you change your mind, you may change your elections with respect to your Eligible Options by accessing the Offer website at https://kla.equitybenefits.com and completing a new Election Form before 11:59 p.m., Pacific Time on March 27, 2007. Any questions or requests for assistance should be directed to Tracy Laboy at (408) 875-7131 or tracy.laboy@kla-tencor.com.

Please note that our receipt of your Election Form is not by itself an acceptance of the Eligible Option, For purposes of the Offer, KLA-Tencor will be deemed to have accepted those Eligible Options properly tendered pursuant to the Offer and not otherwise withdrawn only when KLA-Tencor gives written or electronic notice to the option holders generally of its acceptance of such options. Such notice may be made by press release, email or other method of communication. KLA-Tencor’s formal acceptance is expected to take place immediately following the expiration date of the Offer.