Network Appliance Announces Preliminary First Quarter Fiscal Year 2006 Results

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Sunnyvale, Calif. - August 4, 2005 - Network Appliance, Inc. (NASDAQ: NTAP), the leader in advanced networked storage solutions, today announced preliminary results for the fiscal year 2006 first quarter ending July 29, 2005. Revenues are expected to be in the range of $446 to $449 million, down approximately 1% sequentially from the fourth quarter of FY2005, and up 24% to 25% over the first quarter of FY2005. GAAP and non-GAAP1 net income per share are expected to be in the range of $0.15 to $0.16.

These preliminary results are below the company's previously stated targets issued on May 24, 2005 for a sequential revenue increase of 3% to 6% which equates to approximately $465 to $479 million, for GAAP net income per share of $0.16 and $0.17, and non-GAAP net income per share of $0.17 to $0.18. Network Appliance will announce final results on August 17, 2005 after the close of market.

"The primary factor impacting our results this quarter was a product transition to our new midrange FAS3000 series. The market response to the new product line has been very positive, however the take up rates were more back-end loaded than we had planned," said Dan Warmenhoven, CEO of Network Appliance. "We remain confident in the competitiveness of our products and in our ability to grow our business over the long term."

Conference Call Information
The NetApp preliminary first quarter results conference call will be broadcast live via the Internet at http://investors.netapp.com/ today, Thursday, August 4, 2005, at 2:00 p.m. Pacific Time. This press release and any other information related to the call will also be posted to the Web site at that location. The listen-only conference call will also be available live at (866) 543-6405 in the United States and (617) 213-8897 outside the United States. The passcode for both numbers is 24411279.

A replay will be available for seven days following completion of the live call by dialing (888) 286-8010 in the United States and (617) 801-6888 outside the United States, with replay code 48571288.

About Network Appliance
Network Appliance is a world leader in unified storage solutions for today's data-intensive enterprise. Since its inception in 1992, Network Appliance has delivered technology, product, and partner firsts that simplify data management. Information about Network Appliance solutions and services is available at www.netapp.com.

"Safe Harbor" Statement under U.S. Private Securities Litigation Reform Act of 1995
This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The preliminary first quarter results in this release are forward looking statements. Actual, final results could vary because of any accounting adjustments made during the quarterly close.

Network Appliance Usage of non-GAAP Financials
The Company refers to the non-GAAP financial measures cited above in making operating decisions because they provide meaningful supplemental information regarding the Company's operational performance. In addition, these non-GAAP financial measures facilitate management's internal comparisons to the Company's historical operating results and comparisons to competitors' operating results. We include these non-GAAP financial measures in our earnings announcement because we believe they are useful to investors in allowing for greater transparency with respect to supplemental information used by management in its financial and operational decision making such as employee compensation planning. In addition, we have historically reported similar non-GAAP financial measures to our investors and believe that the inclusion of comparative numbers provides consistency in our financial reporting at this time.

1 Non-GAAP results exclude amortization of intangible assets, in process research and development, stock compensation, restructuring charges (recoveries), net gain on investments and the related effects on income taxes.

Press Contact:
Network Appliance, Inc.
Jodi Baumann
Ph: (408) 822-3974
jodi@netapp.com

Investor Contacts:

Network Appliance, Inc.
Tara Calhoun
Ph: (408) 822-6909
tara@netapp.com

Network Appliance, Inc.
Billie Fagenstrom
Ph: (408) 822-6428
billief@netapp.com
.