<A target="_blank" href="http://www.pcworld.com/article/202425/office_2011_pricing_penalizes_owners_of_multiple_macs.html?tk=rss_news">If you have a Mac and you want to upgrade to Office 2011, the Home and Student version</A> will not include an e-mail client. Also, while Office 2008 allowed you to install it on up to six machines, Office 2011 limits you to one machine.