Office 2010 Developer Resources
MSDN VSTO Forum: http://social.msdn.microsoft.com/Forums/en-US/vsto/threads
Office Fluent User Interface Control Identifiers: http://www.microsoft.com/download/en/details.aspx?id=6627
The Office 2010 Outlook Object Model: http://msdn.microsoft.com/en-us/library/ff870566.aspx