One user to receive copies of ALL email sent to his company?

Hi All,

What is the best way for me to set this up?  I have a client with 15 Office 365 accounts. The owner of the company had always had their old POP mail set up so that all mail received by anyone was also forwarded to his email box. 

He wants to do the same with the new Office 365 that they have.  So, how do I set this up so that any mail sent to any of the other accounts also get copied to his?

Thanks!

Gene O'Brien
Technology Service of Long Island