Sustained User Adoption is vital to ensure people using SharePoint remain productive and proactive. Pro-activity is key, since the reliance on SharePoint support will grow based – success breeds success; on solving user queries, meeting and solving business information and collaborative challenges using SharePoint, delivering solutions. A significant number of queries will come from the use of Microsoft Office with SharePoint. Particularly since virtually all interaction with content in SharePoint will come from the use of Microsoft Products such as Word, Excel, PowerPoint, Outlook, and even moving beyond into the lands of Project, Visio, OneNote (the list continues).
If you want sustainable User Adoption, amongst other techniques, focus on the information workers core toolset – Microsoft Office. For information workers to remain SharePoint productive, to make them more empowered, to give them a sense of achievement, you should consider informing and evangelizing to them the Microsoft Office Specialist certification, of which SharePoint is part.