Your signature says you have 10.5.3 - is this correct? If not please amend it to prevent confusion.
Leopard is not compatible with iCloud. The System Preferences>MobileMe>Sync pane does nothing: this method is not in use with iCloud.
Leopard cannot access most of iCloud's facilities, however you can set Mail up manually to access your email. The method is described here:
You will not be able to sync calendars or contacts, not access any of iCloud's other facilities.
Hi Roger. Thanks for your reply. My Mac is new and I should have updated my operating system information. I will do that right now. My OS is 10.7.3. My problem persists, not being able to sync my mail with iCloud. My calendar and photostream work very well.
Any assistance would be most appreciated.