Would you like to expand your search capabilities in your lookup fields? Enabling Enhanced Lookups can make that happen.
To turn on Enhanced Lookup in your org, go to Setup -> Customize -> Search -> Search Settings, then enable Enhanced Lookup and choose which objects should have access to this feature.
Once you’ve turned on this feature, you will have the option to select All Fields when you’re in the Lookup window to search by any field on the object, such as Account Number or Email Address.
With this feature, you get the power of universal search even in your lookup windows!