Hi Beth, iCloud requires Lion, and Lion requires Snow Leopard since you will need the Mac App Store to purchase it and probably every OS after it.
Unfortunately you will have to upgrade to Snow Leopard first, but it's only $29 and I understand that it may be free for some Mobile Me subscribers.
Read this to see if you qualify:
Oh by the way, if you are really using a Power Mac as it says in your profile, you are stuck with Leopard since Snow Leopard needs an Intel CPU.
Message was edited by: John Galt
Here are the requirements for Lion:
OS X Lion system requirements
To use Lion, make sure your computer has the following:
- An Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
- Mac OS X v10.6.6 or later to install via the Mac App Store (v10.6.8 recommended); you can install without Mac OS X v10.6 by using an OS X Lion USB Thumb Drive, available on the Apple Online Store
- 7 GB of available disk space
- 2 GB of RAM
OS X upgrades do not wipe out your data. However, every major OS upgrade has the potential to break things that you are accustomed to using. Most of those problems will be mere nuisances, however, It is imprudent to upgrade OS X without a backup plan. I highly recommend using Time Machine since you already have it, and using an externally connected hard disk as your backup device. Hard disks are a lot less expensive than they used to be so there is no reason not to use Time Machine.
Also, if you are using any PowerPC (PPC) apps, such as old versions of Microsoft Office or AppleWorks, they will not work with Lion. If you have an absolute need for such programs then you must create a boot partition containing Leopard or Snow Leopard.
Buy an external storage device such as one of these:
Choose one that is at least equal to the size of your iMac's internal hard disk.
Download and install a "clone" utility such as Carbon Copy Cloner or SuperDuper! and use it to "clone" your iMac's hard disk to the external one. That way, you will have an exact copy of your iMac's Leopard installation.
By using the Mac's Startup Manager (hold an Option key while you start the Mac), you can choose to start your computer using the external one, which will be identical to everything you do now, or the internal one, which will contain whatever OS you choose to upgrade to.