On another email account whenever I start to write an address, if the message is to an address to which I I have sent previous messages, I get prompts in the address box suggesting completion of the address. Is that feature availble on my Comcast account?
Address completion is a feature of the email CLIENT you are using, it has nothing to do with where you have your email account from. For example, I use my Comcast email account with multiple clients on different systems. My Mac Mail and Windows Mail clients, as well as my iPhone Mail client all do address completion, but the SmartZone web client does not.
Actually, the full-featured SZ client should do address completion if the person is in your address book. Not sure if previous senders/recipients are included in the auto-complete cache, but definitely address book members.
It definitely doesn't work for addresses you've simply used before, as in typed in. My address book on SmartZone is empty since I never use it except for tests, so I would not have seen this behavior. Thanks for pointing that out.