Microsoft’s platform for unified messaging Office Communications Server 2007 is relatively complicated to install. Further integration with external systems is needed to make voice calls using the public-switched telephone network (PSTN). OCS 2007 also has several rather complex dependencies that must be available on your network. For example, you will also need Internet Information Server (IIS) on servers hosting OCS 2007 and an Active Directory (AD) Domain Controller on your network. The OCS Trial package includes SQL Server 2005, but OCS 2007 does not include SQL Server, which must be bought and installed separately.

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