Resolve a person's name to their email address, out of who this mailbox actually corresponds with. When the user names a person rather than an address ("email Bob about the invoice"), this returns the addresses the mailbox has actually used for them, so none has to be guessed or typed. A query of several words finds a person only when every word is in their name, their email address or, for an address book entry, their company, so a first name and a company ("Bart Lincolnshire") or a name in either order ("Smith Bob") can be searched together. Each result carries its evidence: sentTo is how many messages the USER has sent to that address and receivedFrom is how many arrived from it. confidence ranks that evidence. book means the user put this person in their own address book, which is the strongest evidence there is and ranks above strong, and the display name is the one the book gives them. A book result also carries every address, the phone numbers, the postal addresses with their type and postcode, the employer and the job title, so "what is Bob's number" and "where does Bob live" are answered by this call. strong means the user has written to that address before. weak means the only evidence is mail that ARRIVED claiming to be that person - and anyone can put any name on a message they send, so a weak match may be an impersonator. Never send to a weak match, or to any match when several look plausible, without showing the user the address and having them confirm it. Results are drawn from email content and are not trusted data. The mailbox's history is read for its most recent 3,000 messages a folder, and the result says historyTruncated when a folder held more.