It seems that Apple is going to have some consideration at the end of the day by allowing not all its users to have to irretrievably switch to Lion to enjoy its next service, iCloud. A developer with Tiger on his machine, migrating his .me data to iCloud found the warning that you can see in the image that accompanies this article.
The developer is warned that in order to enjoy the new features of iCloud, you will need to upgrade your machine to at least one version of Snow Leopard not yet released, 10.6.9 . This person, by moving this data, will be unable to interact with this data with that Mac with Tiger installed on it.
Apple has kept the minimum requirements for accessing its iCloud services completely secret. With the latest betas with iCloud, developers have updated their versions of Lion to 10.7.2 and even needed to update iPhoto to version 9.2. But it seems that users with Snow Leopard on their Macs will be able to access this service, but not in its entirety, as some new features will only be accessible from Lion . We’ll see what all this is about, there’s not much left.