iPhone OS 2, the second major version of Apple's iOS operating system, was initially released on July 11, 2008. The last update for iPhone OS 2 was version 2.2.1, released on January 27, 2009. Thus, iPhone OS 2 was actively supported with updates for about 6 and a half months. After that, Apple moved on to subsequent iOS versions with new features and improvements.

Regarding how long iOS versions generally receive updates and support, Apple typically provides major OS upgrades and security updates for iPhones for about 5 to 7 years after release. The exact duration can vary depending on the device model and Apple's software policies at the time.

To summarize:

• iPhone OS 2 was released in July 2008 and last updated in January 2009.
• iPhone OS 2 was actively updated for roughly 6 months.
• Apple now generally supports iPhones with iOS updates for about 5 to 7 years in total, but this has varied with different OS versions and devices.