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In an Exchange Server 2007 Service Pack 1 (SP1) environment, Exchange Web Services (EWS) exposes a property of contacts to enable programmatic modification of the e-mail addresses associated with the contact. However, if you use EWS to change an existing contact’s EmailAddress1, EmailAddress2 or EmailAddress3 field, the change does not occur as expected in Outlook or in Outlook Web Access (OWA). Additionally, if you use the EWS application programming interface (API) to create a contact that includes the EmailAddress1, the EmailAddress2 or the EmailAddress3 field, the contact does not work correctly within Outlook or within OWA.
Note You may see the changes if you check the Details pane of the address in Outlook 2007.
This issue occurs because EWS only changes one of the properties that are associated with the e-mail address and this change of the property is not reflected in the user interface of Outlook or of OWA. When this issue occurs, the values of the other properties are shown in Outlook or in OWA.
To resolve this problem, install Update Rollup 9 for Exchange 2007 Service Pack 1. For more information about Update Rollup 9 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: