I went to the Apple website, and they only talk about the upgrade to 10.7 from its previous version, 10.6.x. (and I know 10.8 is coming out soon).
I am the new tech who tries to support a small number of Mac users in my office, and although they all want to upgrade to 10.7, I know they have different machines with different specs that they do not all run the version 10.6.x of Mac OS X. Do I have to upgrade successively to each version of the OS, up to 10.7, or can I get them all to the latest version in one step (given that their hardware will support it)?
Also, are the OS upgrades reliable, or is there a history of data loss when performing such an upgrade? Is there an upgrade map, along with models of Macs that I can look at? On the Apple website, they talk about upgrading from 10.6 to 10.7, but nothing for prior versions.