In the current setup, to ensure you have the latest Service Description when you need it, you'll actually need to download the Word document in question - and many of you have suggested to us that we provided at more userfriendly way to ensure an easier way of consulting the most recent Service Description.
Along with the next version of Office 365 we will update how we deliver the Service Descriptions - from Word documents to TechNet articles.
Please find the new service descriptions here
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Will there be a way to subscribe to updates to the service descriptions? i.e. Receiving an email notification or at the very least an RSS feed?
Check this for Office 365 Online Support