Internet Security Systems Stockholders Approve IBM Merger Agreement

  
    
  
  
    
      Internet Security Systems, Inc. (ISS) (NASDAQ: ISSX) today announced 
      that at a special meeting of stockholders held today, the Company's 
      stockholders approved the Agreement and Plan of Merger, dated August 23, 
      2006, by and among International Business Machines Corporation, Aegis 
      Acquisition Corp. and Internet Security Systems, Inc.
    
    
      ISS currently expects the transaction to close on or about October 23, 
      2006, subject to the satisfaction or waiver of remaining closing 
      conditions. Upon closing of the merger, ISS will become a wholly-owned 
      subsidiary of IBM, and ISS’ common stock will 
      consequently no longer be listed on The NASDAQ Global Select Market.
    
    
      About IBM
    
    
      For more information about IBM, go to www.ibm.com.
    
    
      About Internet Security Systems, Inc.
    
    
      Internet Security Systems, Inc. (ISS) is the trusted security advisor to 
      thousands of the world’s leading businesses 
      and governments, providing preemptive protection for networks, desktops 
      and servers. An established leader in security since 1994, the ISS 
      Proventia® integrated security platform is 
      designed to automatically protect against both known and unknown 
      threats, keeping networks up and running and shielding customers from 
      online attacks before they impact business assets. ISS products and 
      services are based on the proactive security intelligence of its X-Force® 
      research and development team – the 
      unequivocal world authority in vulnerability and threat research. The 
      ISS product line is also complemented by comprehensive Managed Security 
      Services and Professional Security Services. For more information, visit 
      the ISS Web site at www.iss.net or call 
      Heidi Litner at 404-236-3763.
    
    
      Internet Security Systems is a trademark and Proventia and X-Force are 
      registered trademarks of Internet Security Systems, Inc. All other 
      companies and products mentioned are trademarks and property of their 
      respective owners.
    
    
      Safe Harbor Statement under the Private Securities Litigation Reform 
      Act of 1995:
    
    
      This release contains forward-looking statements based on current 
      expectations or beliefs, as well as a number of assumptions about future 
      events, and these statements are subject to important factors and 
      uncertainties that could cause actual results to differ materially from 
      those described in the forward-looking statements. The forward-looking 
      statements in this release address a variety of subjects including, for 
      example, fulfillment of conditions to, and the expected timing of, the 
      closing of the proposed merger. The following additional factors, among 
      others, could cause actual results to differ materially from those 
      described in these forward-looking statements: the timing and results of 
      required regulatory review and approval of the proposed merger; and 
      those factors discussed in the Section entitled “Risk 
      Factors” in Part II Item 1A of ISS’ 
      Quarterly Report on Form 10-Q for the quarter ended June 30, 2006. ISS 
      disclaims any intent or obligation to update any forward-looking 
      statements made herein to reflect any change in ISS’ 
      expectations with regard thereto or any change in events, conditions, or 
      circumstances on which such statements are based.
    
  
Internet Security Systems, Inc. (ISS) (NASDAQ: ISSX) today
announced that at a special meeting of stockholders held today, the
Company's stockholders approved the Agreement and Plan of Merger,
dated August 23, 2006, by and among International Business Machines
Corporation, Aegis Acquisition Corp. and Internet Security Systems,
Inc.

   ISS currently expects the transaction to close on or about October
23, 2006, subject to the satisfaction or waiver of remaining closing
conditions. Upon closing of the merger, ISS will become a wholly-owned
subsidiary of IBM, and ISS' common stock will consequently no longer
be listed on The NASDAQ Global Select Market.

   About IBM

   For more information about IBM, go to www.ibm.com.

   About Internet Security Systems, Inc.

   Internet Security Systems, Inc. (ISS) is the trusted security
advisor to thousands of the world's leading businesses and
governments, providing preemptive protection for networks, desktops
and servers. An established leader in security since 1994, the ISS
Proventia(R) integrated security platform is designed to automatically
protect against both known and unknown threats, keeping networks up
and running and shielding customers from online attacks before they
impact business assets. ISS products and services are based on the
proactive security intelligence of its X-Force(R) research and
development team - the unequivocal world authority in vulnerability
and threat research. The ISS product line is also complemented by
comprehensive Managed Security Services and Professional Security
Services. For more information, visit the ISS Web site at www.iss.net
or call Heidi Litner at 404-236-3763.

   Internet Security Systems is a trademark and Proventia and X-Force
are registered trademarks of Internet Security Systems, Inc. All other
companies and products mentioned are trademarks and property of their
respective owners.

   Safe Harbor Statement under the Private Securities Litigation
Reform Act of 1995:

   This release contains forward-looking statements based on current
expectations or beliefs, as well as a number of assumptions about
future events, and these statements are subject to important factors
and uncertainties that could cause actual results to differ materially
from those described in the forward-looking statements. The
forward-looking statements in this release address a variety of
subjects including, for example, fulfillment of conditions to, and the
expected timing of, the closing of the proposed merger. The following
additional factors, among others, could cause actual results to differ
materially from those described in these forward-looking statements:
the timing and results of required regulatory review and approval of
the proposed merger; and those factors discussed in the Section
entitled "Risk Factors" in Part II Item 1A of ISS' Quarterly Report on
Form 10-Q for the quarter ended June 30, 2006. ISS disclaims any
intent or obligation to update any forward-looking statements made
herein to reflect any change in ISS' expectations with regard thereto
or any change in events, conditions, or circumstances on which such
statements are based.