Microsoft Windows NT 4.0 Service Pack 6a (Alpha) with High Encryption

Name: Microsoft Windows NT 4.0 Service Pack 6a (Alpha) with High Encryption
Rating: 4 (1 reviews)
Author: Microsoft

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Used Microsoft Windows NT 4.0 Service Pack 6a (Alpha) with High Encryption for Windows?

Windows NT 4.0 Service Pack 6a (SP6a) resolves the SP6 issue with Lotus Notes and other Winsock based applications and provides the latest updates to Microsoft Windows NT Workstation 4.0 and Windows NT Server 4.0 (including Enterprise Edition). Windows NT 4.0 SP6a contains known Year 2000 updates for Windows NT 4.0 This version provides 128-bit encryption capabilities for computers running on the DEC Alpha platform. The High Encryption version of Windows NT 4.0 SP6a is eligible for export from the U.S. to all customers worldwide, except to U.S. embargoed destinations.

If you are unsure whether your NT 4.0 system needs this service pack, refer to Microsoft's documentation.

Editors’ Review

Download.com staffFebruary 26, 2026

This service pack provides crucial updates for Windows NT 4.0, resolving compatibility issues and adding essential features like Y2K fixes and enhanced encryption.

Pros
- Resolves SP6 issues with Lotus Notes and Winsock apps.
- Includes latest updates for NT Workstation and Server.
- Contains Year 2000 updates.
- Provides 128-bit encryption for DEC Alpha.
- Eligible for worldwide export.
Cons
- Specific platform requirement for high encryption.