# Mac OS X Leopard

> sixth major release of OS X

**Wikidata**: [Q222996](https://www.wikidata.org/wiki/Q222996)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Mac_OS_X_Leopard)  
**Source**: https://4ort.xyz/entity/mac-os-x-leopard

## Summary
Mac OS X Leopard is the sixth major release of the OS X operating system developed by Apple Inc. for Apple computers. Released on October 26, 2007, it is a UNIX 03 certified operating system that succeeded Mac OS X Tiger and preceded Mac OS X Snow Leopard.

## Key Facts
- **Developer:** Apple Inc.
- **Initial Release Date:** October 26, 2007
- **Final Stable Version:** 10.5.8 (released August 5, 2009)
- **Version Number:** 10.5
- **Platforms:** PowerPC and IA-32
- **Preceded By:** Mac OS X Tiger
- **Succeeded By:** Mac OS X Snow Leopard
- **Certification:** Single UNIX Specification (UNIX 03)
- **Base Architecture:** Darwin
- **License:** Apple Public Source License and end-user license agreement

## FAQs
### Q: What version of OS X is Leopard?
A: Mac OS X Leopard is version 10.5. It was the sixth major release in the OS X series, following version 10.4 (Tiger).

### Q: When was the final update for Mac OS X Leopard released?
A: The final stable version, 10.5.8, was released on August 5, 2009. This concluded a series of nine stable updates that began with the initial 10.5.0 launch in October 2007.

### Q: What hardware platforms can run Mac OS X Leopard?
A: Mac OS X Leopard supports both PowerPC and IA-32 (Intel) processor architectures. It was the last major release to support the PowerPC platform before Snow Leopard became Intel-exclusive.

## Why It Matters
Mac OS X Leopard represents a significant technical milestone for Apple as the first version of OS X to receive the UNIX 03 certification, meeting the Single UNIX Specification. As the sixth major release of the operating system, it served as a bridge between older PowerPC-based hardware and the newer IA-32 (Intel) architecture. 

Developed by Apple Inc. at its headquarters in Cupertino, Leopard maintained the company's focus on integrated hardware and software management. It provided a stable platform for users through nearly two years of active updates, eventually handing over to Mac OS X Snow Leopard in late 2009. Its reliance on the Darwin open-source foundation and the Aqua graphical user interface helped define the user experience for Apple computers during the late 2000s.

## Notable For
- **UNIX 03 Certification:** Officially compliant with Version 3 of the Single UNIX Specification.
- **Dual Platform Support:** Compatible with both PowerPC and IA-32 computer architectures.
- **Aqua Interface:** Utilizes the Aqua graphical user interface toolkit and framework.
- **Darwin Foundation:** Built upon the Darwin computer operating system.

## Body

### Development and Release
Mac OS X Leopard was developed by Apple Inc. and released on October 26, 2007. It is part of the macOS series of operating systems, which originally debuted in March 2001. The development of Leopard followed the 2005 release of Mac OS X Tiger.

### Technical Architecture
The system is based on Darwin and is classified as an operating system that manages computer hardware resources. It is notable for its product certification as a Single UNIX Specification (UNIX 03) system. The software was distributed under the Apple Public Source License and a standard end-user license agreement.

### Version History
Apple released several incremental stable versions of Leopard to improve system performance and stability:
*   **10.5.0:** October 26, 2007 (Initial release)
*   **10.5.1:** November 15, 2007
*   **10.5.2:** February 11, 2008
*   **10.5.3:** May 28, 2008
*   **10.5.4:** June 30, 2008
*   **10.5.5:** September 15, 2008
*   **10.5.6:** December 15, 2008
*   **10.5.7:** May 12, 2009
*   **10.5.8:** August 5, 2009 (Final stable version)

### Succession
Mac OS X Leopard was succeeded by Mac OS X Snow Leopard (version 10.6), which was released on August 28, 2009. While Leopard supported both PowerPC and IA-32 platforms, its successor focused on the seventh major release of the OS X lineage.

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## References

1. lobid
2. Freebase Data Dumps. 2013