THIS NOTICE CONSTITUTES AMENDMENT NO. 4 TO THE COMBINED SYNOPSIS/RFQ FOR PDMLINK9.1 UPGRADE. Companies shall acknowledge all amendment(s) in their quote. This noticeserves as the official amendment to subject synopsis/RFQ and a written amendment will notbe issued.The purpose of this amendment is to EXTEND THE DUE DATE FOR RESPONSES.The due date for receipt of offers IS extended to AUGUST 17, 2009.Companies shall provide the information stated in the synopsis/RFQ posted on the NASAAcquisition Internet Service (NAIS) on AUGUST 6, 2009. Documents related to thisprocurement are available over the Internet. These documents reside on a World Wide Web(WWW) server which may be accessed using a WWW browser application. The Internet site, orURL, for the NASA/LaRC Business Opportunities home page ishttp://prod.nais.nasa.gov/cgi-bin/eps/bizops.cgi?gr=D&pin=23

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