Help needed with Mail (Version 3.6 (936)) and iCloud

Hello, I‘ve got problems with synchronizing my emails with Mail (Version 3.6 (936)) and iCloud. I started to synchronize my iPhone 5 and iMac at work OS X 10.8. On my Power Mac at home I only receive older mails (latest is from 04/25 this year) and sometimes the same mail 7 times. When i try to quit Mail it doesn‘t work and I've to use the shortcut: +alt+shift+esc.

I think that my Mail-Version doesn‘t work together with iCloud but perhaps there‘s a possibility to fix this problem with a trick.

Thanks for your help

Best regards

Stefan 🙂