VSTO for Outlook HowTo: add button to toolbar, how to
create Outlook plugin / addin, commandbar in C#, VB.NET
Add-in Express .NET for VSTO and Outlook add-ins
Add-in Express has a lot of advanced features for VSTO Outlook add-in developers that can save a lot of your time when building an Outlook plug-in interface. Here are some of them:
Add-in Express for VSTO works with Visual Studio Tools for Office 2005 (SE) as well as with VSTO 2008 and VSTO 2010 and allows developing COM add-ins for Microsoft Outlook 2003 and Outlook 2007.
VSTO HowTo for Outlook plug-ins
To create Outlook Explorer and Inspector CommandBars at design-time use the popup menu or the commands in the Command Panel.
Add-in Express for VSTO Outlook commandbar component provides you with the FolderName property for automatic showing / hiding Outlook CommandBars for a given folder. Just change the FolderName value to a full name of the Outlook folder which the VSTO CommandBar should be shown for.
In the FolderNames property, specify full names of the folders that your CommandBar should be shown for.
Besides specifying folder names, you may want your VSTO CommandBar to show up for certain folder types. Use the ItemTypes property provided by Add-in Express for VSTO.
Use familiar Visual Studio interface to add any command bar controls. Use the AdxCommandBarControl to add built-in Outlook toolbar controls onto your VSTO commandbar.
Use standard Add New Item command to create an Options page in Visual Studio Tools for Office 2005 SE - 2010.