Email Search Assistant

Looking for an AI that can link to my email to keep a history/memory of email conversations. I would like to be able to ask questions about past conversations and have the email assistant find the email, or answer questions about it. Examples:
What time am I supposed to meet with Steve?
Find the email where we discussed the issues with Nancy's house.
I'm about to call Bill, make a list of all questions he has asked about ipods.