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                                                                    EXHIBIT 99.1

                                                                     ADMINISTAFF

                  Administaff Announces Two-For-One Stock Split

         HOUSTON, Sept. 14 /PRNewswire/ -- Administaff, Inc. (NYSE: ASF), the
leading Professional Employer Organization (PEO), today announced that its Board
of Directors has approved a two-for-one split of its common stock. The stock
split will be effected in the form of a stock dividend, and will entitle each
stockholder of record at the close of business on Sept. 25, 2000 to receive one
additional share of common stock for each share of the company's common stock
held on that date. The additional shares will be distributed on Oct. 16, 2000.

         As of September 12, 2000, Administaff had approximately 13.7 million
shares of common stock outstanding. When the split is completed, that number
will increase to approximately 27.4 million shares.

         Administaff is a leading personnel management company that serves as a
full-service human resources department for small and medium-sized businesses
throughout the United States. With 1999 revenues of $2.3 billion, Administaff
ranks number 615 on the Fortune 1000 list. The company also is included for the
second consecutive year on Fortune's list of "America's Most Admired Companies"
and for the third consecutive year on the Information Week 500 list of leading
information technology innovators.

         Administaff's Personnel Management System includes employment
administration, benefits management, government compliance, recruiting and
selection, employer liability management, training and development, performance
management and owner support. These core services are complemented by an
eBusiness strategy that includes Administaff Assistant(SM), an eService platform
that provides clients and worksite employees with information and resources to
help maximize the benefit of their Administaff services; and bizzport(SM), an
eCommerce portal that features value-added products and services from
best-of-class providers such as American Express, Aon Enterprise, AT&T, Bank
One, Dell, Forrester Research, IBM, MobShop and works.com.

         Administaff has 29 sales offices in 17 major markets. For additional
information, visit the company's web site at www.administaff.com.

         (Note: The statements contained in this press release that are not
historical facts are forward-looking statements that involve a number of risks
and uncertainties. Therefore, the actual results of future events described in
such forward-looking statements could differ materially from those stated in
such forward-looking statements. Among the factors that could cause actual
results to differ materially are: (i) regulatory and tax developments; (ii)
changes in Administaff's direct costs and operating expenses; (iii) the
estimated costs and effectiveness of capital projects and investments in
technology and infrastructure; (iv) Administaff's ability to effectively
implement its eBusiness strategy; (v) the effectiveness of Administaff's sales
and marketing efforts, including the company's marketing arrangements with other
companies; and (vi) changes in the competitive environments in the PEO industry.
These factors are described in further detail in Administaff's filings with the
Securities and Exchange Commission.)