Yes, but you have to buy it. 10.4.11 is Tiger while 10.5 is Leopard, different versions. I suggest waiting for the next generation Snow Leopard coming out shortly (September 2009) which is $29 and upgrades the Leopard.
Not directly. Apple's operating systems build on themselves, so you need to install 10.5 before 10.6. You can purchase a 10.5 disc on websites such as eBay and Amazon, but Apple no longer sells them.
Can you upgrade to 10.5 from 10.4? yes. Can you buy and download a digital copy of 10.5 while booted in 10.4, yes.
Yes, you can upgrade to Lion from any iMac that uses the Intel processor. But the newest OS is Mountain Lion.
Providing the Mac running Tiger has an Intel processor then the Snow Leopard upgrade will work.
NO
No, the latest operating system is Mountain Lion. Snow Leopard was replaced by Lion and then Mountain Lion. Snow Leopard came out June 2008, Lion was released on Oct, 2010, and Mountain Lion was released July, 2012.
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Boite mac Cináeda died in 1058.
The latest is Mac OSx 10.8.3 Mountain Lion as of 3/18,2013.
Mac OS X Lion will be release some time in July of 2011. UPDATE: Mac OS X Lion will be released ONLY on the Mac App Store no DVD's on July 14th, 2011
Flaithem Mac Mael Gaimrid died in 1058.
According to the Apple website, Mac OSX Mountain Lion can be purchased for $19.99 if you are already running Lion or Snow Leopard. You can purchase directly through the Mac Apple Store icon on your computer.
Porting Team provides a copy of the PC game for the MAC Operating Systems: Snow Leopard, Lion, and Mountain Lion. Check the system requirement before installing the software.
From the Apple menu icon (top left corner) select About This Mac and the version of Mac OS X installed is shown in the window that opens. The Software Update button will list any available updates to your system's software.