My wish list: 1. iOS native sync, preferable without Active Sync. This includes syncing of read states. 2. Custom domains for families and small business without shelling out $10 per user and month. 3. A shared mailbox within the custom domain as „family“ contact mailbox. At least two people should be able to read it, possibly sync read states AND answer from that address, including sent mails need to be stored in this mailbox. 4. A very simple way to setup the accounts on different systems, especially iOS.

AFAIK, except 4 those are already solved, but not within one provider - without paying those mentioned $10/u/m.