I have a user who has two exchange profiles on his Outlook 2007 client on a Windows XP workstation. One connects to his corporate exchange account and the other connects to his personal exchange email account. The problem is when he is in his personal account his global address list from his corporate account is visible from his address book. If he sends an email to a user that happens to be in the global address list of the corporate account then it gets resolved to that contact and the email message bounces back with an undeliverable message. The only way the message will go out is if that email address does not exist in the global address list or if that email address is in his contacts on his personal account so it won't resolve to the contact in the global address list. Is there a way to disable sharing of the contacts between the Outlook profiles like this? Ideally I would like to keep the contacts separate and only visible to the account/profile they are part of.