Service Packs
| Service pack | Release date |
|---|---|
| Service Pack 1 (SP1) | 16 October 1996 |
| Service Pack 2 (SP2) | 14 December 1996 |
| Service Pack 3 (SP3) | 15 May 1997 |
| Service Pack 4 (SP4) | 25 October 1998 |
| Service Pack 5 (SP5) | 4 May 1999 |
| Service Pack 6 (SP6) | 22 November 1999 |
| Service Pack 6a (SP6a) | 30 November 1999 |
| Service Pack 7 (SP7) | Cancelled (18 April 2001) |
Microsoft released Windows NT 4.0 service packs primarily to fix bugs. Windows NT 4.0, during the product's lifecycle, had several service packs, as well as numerous service rollup packages and option packs. The last full service pack was Service Pack 6a (SP6a).
A SP7 was planned at one stage in early 2001, but this became the Post SP6a Security Rollup and not a full Service Pack, released on 26 July 2001, 16 months after Windows 2000 and nearly three months prior to Windows XP.
The service packs also added a multitude of new features such as newer versions of or improvements to Internet Information Services, public-key and certificate authority functionality, user accounts and user profile improvements, smart card support, improved symmetric multiprocessing (SMP) scalability, clustering capabilities, COM support improvements, User Profile Disk Quotas, Event Log service, Security Configuration Manager MMC snap-in, MS-CHAPv2 and NTLMv2, SMB packet signng, SYSKEY, boot improvements, WINS improvements, Routing and Remote Access Service (RRAS), PPTP, DCOM/HTTP tunneling improvements, IGMPv2, WMI, Active Accessibility and NTFS 3.0 support among others.
Read more about this topic: Windows NT 4.0
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