Want to be able to see what someone read or open an email?

Setup outlook to ask for a read or delivery receipt.

To request delivery receipts on all messages you send in Microsoft Outlook 2002 and in Microsoft Office Outlook 2003, follow these steps:

1. On the Tools menu, click Options.
2. On the Preferences tab, click E-mail Options, and then click Tracking Options.
3. Under For all messages I send, request, click to select the Delivery receipt check box, and then click OK.

http://support.microsoft.com/kb/192929

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