Yes, I know: It is US-only at the moment but it might nevertheless pretty interesting for you: We announced yesterday that we will launch a subscription-based Office version called Equipt. Here is an extract from the announcement:
Initially code-named "Albany," Microsoft Equipt offers consumers Microsoft Office Home and Student 2007, giving them the latest versions of Word, Excel, PowerPoint and OneNote for their personal and school projects; Windows Live OneCare, the all-in-one security and PC management service; Windows Live tools, such as Windows Live Mail, Windows Live Messenger and Windows Live Photo Gallery so they can connect and share with people they care about most; and Office Live Workspace, a new service from Microsoft that makes it easy to save documents to a dedicated online Workspace and share them with friends and classmates. Anytime a new version of Office or Windows Live OneCare is released, Microsoft Equipt customers will get the version upgrades as part of their subscriptions.
I am looking forward to this offering so that I can use it for my parents and keep them on the latest version all over the place. It will be $69.99 in the US.