http://blogs.office.com/b/office_blog/archive/2013/02/11/adding-family-members-to-office.aspx"It's mine!" "No, it's mine!" Parents have heard this this battle cry more than a few times. However, there will be no bickering over your new Office subscription. With Office 365 Home Premium you can put Office on up to five PCs and Macs and have multipleen-USTelligent Community 1.5.134.15456 (Build: 5.5.134.15456)http://blogs.office.com/b/office_blog/archive/2013/02/11/adding-family-members-to-office.aspx#35780Tue, 12 Feb 2013 02:24:27 GMT53587256-c606-4c9b-bad4-97c86b12ce62:35780Mike Marcoux<p>I have an Office 365 Home Premium subscription question which I could not find an answer to. &nbsp;I have entered one product key when I created my Office 365 account which gave me 5 licenses for 12 months… &nbsp; I would like to enter another one to stack it like I do my Xbox 360 Live ones to not have to worry about it for a couple of years. &nbsp;If I add another code, will this make it good for 2 years or just add another 5 machines to my account…</p> <div style="clear:both;"></div><img src="http://blogs.office.com/aggbug.aspx?PostID=35780" width="1" height="1">