•Configuration File – The settings used by OWA Extension are defined in the file web.config, which defines the IAP URLs, Exchange Server, and Domain Name and directory information.

•dll Files – The dll files required for the application are in stored the folder:

<Drive>:\Program Files\Microsoft\Exchange

Server\ClientAccess\Owa\Bin

•Customization Files – The files “PERSISTMailItem.ico” (an image file) and “UIExtensions.xml” (a configuration file) are the icon settings for IPM.Note.PersistMailItem message class and are installed in the Exchange path:

\ClientAccess\Owa\forms\Customization\

OWA Extension User Interface Customization

•Registry File – This file defines the custom forms which are used by the different custom message classes defined for OWA Extension. The file contains the path of the aspx page for the four custom classes defined for OWA Extension, which are:

•IPM.Note.PERSISTMailItem

•IPM.Task.PERSISTMailItem

•IPM.Post.PERSISTMailItem

•IPM.Note.Document.PERSISTMailItem

This file is installed into the Exchange path:

\ClientAccess\Owa\forms\PERSISTMailItem\

•Custom Icon – The custom classes defined by OWA Extension make use of a custom icon image file to differentiate these items from the default message classes. OWA Extension requires the image file “PERSISTMailItem.ico” to exist in the path under the Exchange installation location:

\ClientAccess\Owa\forms\Customization\

•HTTP Size Limit – The OWA Extension application updates the value of HTTP size limit to 50,000. This value is defined on the Exchange server in the file Web.config, which exists in folder

\Exchange Server\ClientAccess\exchweb\ews\

under the Exchange installation path. This is done to ensure that mail with larger attachments (up to 50 MB) can be retrieved and displayed.

Pre-installation Consideration – Calendar Items in OWA 2007

OWA Extension does not support retrieval of tombstoned appointment/ calendar items in OWA 2007. When Exchange Server 2007 is installed, users can only retrieve archived calendar items in Outlook.

This is due to a limitation in Microsoft Exchange 2007 – Calendar items are not extensible in OWA 2007. Their functionality cannot be customized, for example, to support an external archive such as the IAP. These types of items are therefore not retrievable from IAP using OWA Extension with OWA 2007.

Microsoft Exchange Server 2000 or 2003 customers who are considering an upgrade to Exchange Server 2007 should be aware of this reduced functionality. Support for archived calendar items is available in both OWA 2000 and OWA 2003.

8