UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE TO
(Amendment No. 4)
TENDER OFFER STATEMENT UNDER SECTION 14(d)(1) OR 13(e)(1)
OF THE SECURITIES EXCHANGE ACT OF 1934

WEBEX COMMUNICATIONS, INC.
(Name of Subject Company (Issuer))

CISCO SYSTEMS, INC. (Parent of Offeror) 
WONDER ACQUISITION CORP. (Offeror) 
(Name of Filing Persons)

Common Stock, par value $0.001 per share	 	94767L 10 9	
(Title of Class of Securities)	 	(CUSIP Number of Class of Securities)	
Dennis D. Powell
Senior Vice President and Chief Financial Officer
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134
(408) 526-4000
(Name, address, and telephone number of person authorized to receive notices and communications on behalf of Filing Persons)

Copies to:

Mark Chandler, Esq.
Senior Vice President, Legal Services,
General Counsel and Secretary
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134
(408) 526-4000	 	Daniel J. Winnike, Esq.
Douglas N. Cogen, Esq.
Fenwick & West LLP
Silicon Valley Center
801 California Street
Mountain View, California 94041
(650) 988-8500	

CALCULATION OF REGISTRATION FEE

Transaction Valuation (1)	 	Amount of Filing Fee (2)	
$2,851,485,777.00	 	$87,540.62	
 
(1)	Estimated for purposes of calculating the filing fee only. This amount is based upon an estimate of the maximum number of shares to be purchased pursuant to the tender offer at the tender offer price of $57.00 per Share.	
(2)	The amount of the filing fee calculated in accordance with the Securities Exchange Act of 1934, as amended, equals $30.70 for each $1,000,000 of value.	
 
x	Check the box if any part of the fee is offset as provided by Rule 0-11(a)(2) and identify the filing with which the offsetting fee was previously paid. Identify the previous filing by registration statement number, or the form or schedule and the date of its filing.	

Amount Previously Paid:	  	$87,540.62	  	Filing Party:    	  	Cisco Systems, Inc. and Wonder Acquisition Corp.	
Form or Registration No.:    	  	SC TO-T	  	Date Filed:	  	March 27, 2007	
 
¨	Check the box if the filing relates solely to preliminary communications made before the commencement of the tender offer.	
Check the appropriate boxes below to designate any transactions to which the statement relates:
x	third party tender offer subject to Rule 14d-1	
¨	issuer tender offer subject to Rule 13e-4	
¨	going private transaction subject to Rule 13e-3	
¨	amendment to Schedule 13D under Rule 13d-2	
Check the following box if the filing is a final amendment reporting the results of the tender offer: ¨

This Amendment No. 4 to the Tender Offer Statement on Schedule TO (this “Amendment”), filed with the Securities and Exchange Commission (the “SEC”) on May 18, 2007, amends and supplements the Tender Offer Statement on Schedule TO filed with the SEC on March 27, 2007, as amended (the “Tender Offer Statement”), and relates to the offer by Wonder Acquisition Corp., a Delaware corporation (the “Purchaser”) and wholly-owned subsidiary of Cisco Systems, Inc., a California corporation (“Cisco”), to purchase all outstanding shares of common stock, par value $0.001 per share (the “Shares”), of WebEx Communications, Inc., a Delaware corporation (“WebEx”), at a purchase price of $57.00 per Share, net to the seller in cash without interest thereon, less any required withholding taxes, upon the terms and subject to the conditions set forth in the Offer to Purchase dated March 27, 2007 (which, together with any amendments and supplements thereto, collectively constitute the “Offer to Purchase”) and in the related Letter of Transmittal (which, together with any amendments or supplements thereto, collectively constitute the “Letter of Transmittal,” and the Letter of Transmittal and the Offer to Purchase, together constitute the “Offer”). Capitalized terms used and not defined herein shall have the meanings assigned to such terms in the Offer to Purchase.
The Offer is made pursuant to the Agreement and Plan of Merger, dated as of March 15, 2007 (the “Merger Agreement”), among Cisco, the Purchaser and WebEx.
The information in the Offer to Purchase and the related Letter of Transmittal is incorporated in this Amendment by reference to all of the applicable items in the Tender Offer Statement, except that such information is hereby amended and supplemented to the extent specifically provided herein.
Item 11. Additional Information.
The subsection entitled “ Other Foreign Laws ” in Section 16 of the Offer to Purchase entitled “Certain Regulatory and Legal Matters” is amended to add the following new paragraphs at the end of that subsection, reflecting the receipt of the clearances described therein:
“On May 15, 2007, the German Federal Cartel Office provided notification to the Purchaser and Cisco under the German Act against Restraints on Competition that the acquisition of the Shares pursuant to the Offer does not meet the statutory test for prohibition and may be consummated.
On May 18, 2007, the Austrian Federal Competition Authority provided notification to the Purchaser and Cisco under the Austrian Cartel Act 2005 (the “ Cartel Act ”) that none of the Statutory Parties within the meaning of Cartel Act had filed a request for an in-depth investigation by the Cartel Court of the acquisition of the Shares pursuant to the Offer.
On May 18, 2007, Cisco announced that it had received the foreign regulatory approvals required to consummate the Offer, which is scheduled to expire at 12:00 Midnight, New York City time, on Monday, May 21, 2007 (which is the end of the day on May 21, 2007). A copy of the press release announcing the receipt of such foreign regulatory approvals is filed as Exhibit (a)(5)(vi) hereto.”
Item 12. Exhibits.
Item 12 of the Tender Offer Statement is hereby amended and supplemented by adding the following exhibit:

		
“(a)(5)(vi)	  	Press Release issued by Cisco on May 18, 2007.”	

After due inquiry and to the best of its knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

W ONDER A CQUISITION C ORP .	
		
By:	 	/s/ Mark Chandler	
Name:	 	Mark Chandler	
Title:	 	Vice President and Secretary	
	
C ISCO S YSTEMS , I NC .	
		
By:	 	/s/ Mark Chandler	
Name:	 	Mark Chandler	
Title:	 	Senior Vice President, Legal Services, General Counsel and Secretary	
Dated: May 18, 2007
  
Exhibit (a)(5)(vi)
			
	 	Press Release	

Press Contact:	 	Investor Relations Contact:	
John Noh	 	Laura Graves	
408 853-8445	 	408 526-6521	
jnoh@cisco.com	 	lagraves@cisco.com	
Cisco Receives Foreign Regulatory Approvals Required to Acquire WebEx
SAN JOSE, Calif. – May 18, 2007 – Cisco Systems, Inc. (NASDAQ: CSCO), today announced that it has received the remaining foreign regulatory approvals required under the merger agreement for it to consummate the tender offer for all outstanding shares of WebEx Communications, Inc. (NASDAQ: WEBX).
The tender offer is scheduled to expire at 12:00 Midnight, New York City time, on Monday, May 21, 2007 (which is the end of the day on May 21, 2007). WebEx stockholders should contact Georgeson Inc., the information agent for the tender offer, at (888) 264-7052 for instructions on how to tender their shares or obtain the offer to purchase and related materials.
As announced previously, on March 27, 2007, Cisco, through its wholly-owned subsidiary Wonder Acquisition Corp., commenced a tender offer for all outstanding shares of WebEx at a price of $57.00 per share net to the seller in cash without interest, less brokerage fees and less any required withholding taxes, pursuant to the definitive merger agreement between Cisco and WebEx.
Securities Law Disclosure
This press release is for informational purposes only and is not an offer to buy or the solicitation of an offer to sell any securities. The solicitation and the offer to buy shares of WebEx common stock will be made only pursuant to an offer to purchase and related materials that Cisco Systems, Inc. and Wonder Acquisition Corp. have filed with the SEC on Schedule TO on March 27, 2007, as amended. WebEx also has filed a solicitation/recommendation statement on Schedule 14D-9, as amended, with respect to the offer. WebEx stockholders and other investors should read these materials carefully because they contain important information, including the terms and conditions of the offer. WebEx stockholders and other investors may obtain copies of these materials without charge from the SEC through the SEC’s website at www.sec.gov, from Georgeson Inc., the information agent for the offer, toll-free at (888) 264-7052 (banks and brokers call (212) 440-9800), from Cisco (with respect to documents filed by Cisco with the SEC) by going to Cisco’s Investor Relations Website at http://www.cisco.com/go/investors , or from WebEx (with respect to documents filed by WebEx with the SEC) by going to WebEx’s Investor Relations Website at www.WebEx.com . Stockholders and other investors are urged to read carefully those materials prior to making any decisions with respect to the offer.

About Cisco Systems
Cisco, (NASDAQ: CSCO), is the worldwide leader in networking that transforms how people connect, communicate and collaborate. Information about Cisco can be found at http://www.cisco.com. For ongoing news, please go to http://newsroom.cisco.com .
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Cisco, Cisco Systems, and the Cisco Systems logo are registered trademarks or trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries. All other trademarks mentioned in this document are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. This document is Cisco Public Information.