The first version of Internet Explorer, (at that time named Microsoft Internet Explorer, later referred to as Internet Explorer 1) made its debut on August 24, 1995. [1] It was a reworked version of Spyglass Mosaic, which Microsoft licensed from Spyglass Inc., like many other companies initiating browser development. Windows Vista Business SP1 (32-bit) Windows Vista Business SP2 (32-bit) Internet Explorer. IE 10. IE 11. IE 5.5 SP1. IE 6. IE 7. IE 8. IE 9. IE6 SP1 MS Office: Microsoft Security Essentials (64 Bits) 4.10.0209.0 Latest This package is available for both the 32 and 64 Bits of Microsoft Windows 7 OS. It came as a replacement for the Windows Live OneCare which was a commercial antivirus service operated on a subscription basis. Biareview.com - Microsoft Security Essentials. 9lphvY.