An essential book to have in the office is a telephone-address book. Often your boss will ask you to get hold of Mr So & So and you will spend a few minutes trying to find the phone number in your phone directory or by phoning national enquiries - wasting precious time. 

Every time you are asked to make a call, add the number to your office phone book.  That way, when you are asked to get Mr So & So on the line, it will just take a flick of the page and there you have it.  Simple!  And, will save you a great deal of unnecessary time wasting, and waiting on hold for someone to give you the contact information you need.

The same principle applies to updating your Outlook address book, if you have access to such a digital system.