The Premier Resource for Microsoft Collaboration Data Objects
Programming Applications for Microsoft Office Outlook 2007.
This book is written by Randy Byrne and Ryan Gregg. Excellent book written by the Microsoft Outlook program managers who worked on the programmability of Outlook 2007.
Microsoft Outlook 2007 Programming: Jumpstart for Power Users and Administrators
By Sue Mosher. Highly recommended for anyone wishing to learn how to program Outlook 2007.
Workflow in the 2007 Microsoft Office System
By David Mann. This book covers all aspects of workflow: from what is all about, to creating new Activities; from InfoPath forms to ASP.Net forms; from the Rules Engine to the object model. Included is a section on integrating Office 2003 clients with SharePoint 2007 workflows.
Learn the basics of MAPI, the key programming interface. This is an official Microsoft guide to writing robust MAPI-compliant components. The CD contains the source code for the sample messaging system, WINDS, as well as sample implementations of a database, a server gateway, and an SQL interface.
Note that the book is out of print but you can order a CD-ROM version on the Inside MAPI Website.
The CD-ROM includes a PDF version of the book as it was originally published in the first edition, along with the sample code, and a copy of Adobe Acrobat Reader.