1.  .NET User Defined Functions
 .NET Object Handles
 .NET Custom Ribbon and Task Panes
 Integrated F#/C#/VB.NET code editors
 Excel and document level customisation

2.  Expose .NET static and instance methods,
constructors and properties as UDFs
 Asynchronous and reactive (Rx) UDFs
 Pass/return from UDF any .NET type with
object handles
 Source code saved in workbook

4.  Custom Ribbon: define menus, buttons etc as
xml
 Custom Task Pane: define as WinForms
UserControl
 No COM registration or installation required
 Redefine and reload without leaving Excel

7.  No UI blocking
 Return F# async<‘T> from UDF
 Return IObservable<‘T> from UDF
 Return IEvent<‘T> from UDF

9.  Access named ranges as strongly typed
properties of ActiveWorkbook
 Refresh type provider at runtime
 Use in interactive F# scripts, UDFs or Ribbon
customisations

11.  Easily access web services from UDFs or with
a click of a button on custom ribbon
 Use F# WSDL and other type providers