- You deploy Microsoft Exchange server and Microsoft Lync Server 2010 in an environment.
- You remove a user's account in Active Directory directory service.
- You set the user's primary Simple Mail Transfer Protocol (SMTP) address as your secondary SMTP address. This prevents messages that are sent to the user from being rejected.
After you apply this update, you can configure the EnableContactMergeUsingProxyAddress setting to disable merging contacts that are based on secondary SMTP addresses.