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Microsoft Support has an article on offline address books which may be helpful in this situation..appears you have cached mode turned on (it is by default on the clients) The Outlook Social connector (Free with Outlook 2010/2013) will do what you are asking for.
It scans your contacts and makes updates based on information in the GAL.
You've received an e-mail message from a potential customer who is interested in some of your products.
From her message, you know that she was referred to you, and you have enough information to create a Lead record for this contact.
In general, Outlook will automatically update the Offline Address Book (OAB) for Exchange accounts once every 24 hours.