3. Office Integration: For the last 15 years, Notes developers and third-party product companies have tried to achieve good integration with Microsoft Office. SharePoint has always had excellent Office integration, and SharePoint 2010 offers additional capabilities. Collaborative editing of Office documents allows multiple users to open the same Word document simultaneously and a sophisticated change tracking interface allows them to see changes made by other users almost instantly. Office Web Apps provide completely browser-based versions of Word, Excel, PowerPoint, etc., so users can view and edit documents in SharePoint without having to install Office clients.
4. Offline Capabilities: Although many of us count on continuous internet connectivity and bandwidth, many legacy Notes applications depend on the ability to "go offline." Notes is famous for its ability to replicate to your laptop whatever data you need to continue working while unplugged.
SharePoint appeared a decade later, designed for a modern connected world and optimized for server applications that delivered much lower cost of ownership and many other benefits. However, there still are times when you need the ability to work on a plane, at a customer site where you can't access the internet, or in your vacation home "off the grid."
SharePoint Workspaces address this need. You can synchronize lists, libraries and entire sites to your laptop, use them offline, and then sync up with the site the next time you connect. This functionality is largely based on the Groove technology built by many of the same developers who worked on the original Notes product. Microsoft has done a great job at taking the best of the Groove plumbing and repackaging it as a very compelling offering to fulfill most of the "offline" needs of a typical Notes application.
5. SharePoint Online: Many organizations considering a move from Notes to Microsoft have investigated a hosted environment. The Microsoft Business Productivity Online Suite (BPOS) is an obvious choice with its "Dedicated" version that allows large enterprises to have dedicated private hosted servers, and "Standard" version, in which multiple customers share one hosted environment.