SAP NetWeaver 2004 was the first release of SAP NetWeaver, unifying the wealth of previously separate integration technologies of SAP into an overall synchronized and integrated technology platform. SAP NetWeaver 2004 was released to customers on March 31, 2004.
SAP NetWeaver 7.0 – previously known as 2004s – is the currently available main release of SAP NetWeaver, providing for example a highly scalable and solid application server as a stable foundation for the SAP Business Suite applications like SAP ERP, as well as advanced integration capabilities, for example in the areas of business intelligence or collaboration. SAP NetWeaver 7.0 was released to customers on Oct 24, 2005
Netweaver 2004s SR2
SR1 and SR2 are northing but the releases.
Yes, ECC 6.0 is equivalent of Netweaver 2007 and ECC 5.0 the same as Netweaver 2004.