Microsoft has released security bulletin MS06-019. The security bulletin contains all the relevant information about the security update for Microsoft Exchange Server 2003 and for Microsoft Exchange 2000 Server Service Pack 3 (SP3). This includes file manifest information and deployment options. To view the security bulletin, visit the following Microsoft Web site:
If you are using Microsoft Exchange Server 2003 Service Pack 1 (SP1) and you install this security update, Microsoft Entourage and third-party services such as Blackberry or GoodLink may be affected. Access to shared mailboxes may also be affected. If you are using Microsoft Exchange Server 2003 Service Pack 2 (SP2) or Microsoft Exchange 2000 Server and you install this security update, these issues do not apply. If you are using Microsoft Exchange Server 2003 Service Pack 1 (SP1), review Microsoft Knowledge Base article 912918 before you install this security update.
912918 (http://support.microsoft.com/kb/912918/) Users cannot send e-mail messages from a mobile device or from a shared mailbox in Exchange 2000 Server and in Exchange Server 2003
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.