It's my understanding that for Office 2010, Office Live Workspaces has been
superseded by SkyDrive, for which no add-in is needed in Office 2010.
Eventually, documents stored on SkyDrive will also be able to take advantage
of Word/Excel/PowerPoint 2010's new co-authoring feature. To get started
there, visit skydrive.live.com. You get 25 GB of free space, which is a bit
more than we had using OLW.