If you are thinking of upgrading 5+ PCs to Microsoft Office Professional you can get a 50% 1st year subscription discount by buying through an Open Value Subscription licence.  From 1 March – 31 May 2011, any customer signing a new Open Value Subscription (OVS) licence agreement for Microsoft Office Professional Plus 2010 is eligible for a 50% discount in the first year of the agreement. This promotion applies only to Microsoft Office Professional Plus 2010 acquired under the Open Value Subscription programme, regardless of the current product version. This offer is not applicable to customers already licensed under the Open Value Subscription programme, and those renewing an Open Value Subscription agreement.

More details and offers on the Small  Business website, including how to get a free 30-day trial of Microsoft Dynamics CRM Online.