Windows NT 3.5
| Windows NT 3.5 | |
|---|---|
| Version of the Windows NT operating system | |
 | |
 Screenshot of Windows NT 3.5 | |
| Developer | Microsoft |
| Working state | No longer supported |
| Source model | Closed source |
| Released to manufacturing | September 21, 1994 |
| Final release | Service Pack 3 (3.5.807) / June 21, 1995 |
| Marketing target | Business and Server |
| Supported platforms | IA-32, Alpha, MIPS, PowerPC |
| Kernel type | Hybrid |
| Userland | Windows API, NTVDM, OS/2 1.x, POSIX.1 |
| License | Commercial proprietary software |
| Preceded by | Windows NT 3.1 (1993) |
| Succeeded by | Windows NT 3.51 (1995) |
| Support status | |
| Unsupported as of December 31, 2001. | |
Windows NT 3.5 is the second major release of the Windows NT operating system developed by Microsoft, targeting the data server and personal workstation markets. It was released on September 21, 1994, as the successor to Windows NT 3.1.
One of the primary goals during its development was to improve the operating system's performance. This is reflected in the product's codename, "Daytona", named after the Daytona International Speedway in Daytona Beach, Florida. Windows NT 3.5 was succeeded by Windows NT 3.51, released in 1995. Support and updates for Windows NT 3.5 was ended by Microsoft on December 31, 2001.
The source code for Windows NT 3.5 (as well as the original Xbox (based on a heavily-modified version of Windows 2000's kernel)) were leaked in 2020.