sentences: "USB 2.0 support was later added with Service Pack 1, and Bluetooth support was partially added with Service Pack 2.The builds prior to and following Release Candidate 1 (build 2505, released on July 5, 2001), and Release Candidate 2 (build 2526, released on July 27, 2001), focused on fixing bugs, acknowledging user feedback, and other final tweaks before the RTM build.