Will Mobileme work on iOS5?

I am itching to upgrade to iOS5 and Lion, but my employer, who owns the MBA I use as my source of itunes syncing, is hesitant to move to Lion. I own the iPhone 4.

All my contacts and calendars are on mobileme, and I know I can update that to become iCloud. However, if I do, will I lose the ability to sync up with the machine running Snow Leopard? I haven't seen mention of this anywhere.

This would all be moot if iCloud worked with Snow Leopard.


Thanks!