Intense Beta has posted a review on the second beta of Office 10.
Similar to the first beta, during the initial installation, the user must choose to run Office in either a subscription or standard mode. With the subscription mode, users must register the product over the Internet and renew the subscription at fixed intervals. The subscription mode is functional in Beta 2, and Microsoft actually encourages beta users to test in both modes. Standard mode allows Office 10 to be installed as usual, but failing to register the product after 20 uses causes the application to go into "reduced functionality mode."Read more