When you are adding recipients in a new mail message (To, CC, BCC), you type a few characters and you see an address you don't want to see in the list of possible adresses. You have to open your Recent Contacts view, search for this address and choose "Hide in ...
It would be really nice to have type-ahead functionality in iNotes. I get asked this all the time. Other webmail clients (Gmail) do it. Why can't iNotes?
It would great to type the company name in the recipient input field and get a result list of the employee's email addresses.