Get this wrong, and the OCS implementation will
always be suspect.
Addressing the Prerequisites
As mentioned, before you can begin to install OCS 2007, you fi rst need to address some
prerequisites. Before we get to the prerequisites, though, we need to discuss choosing the
correct version of OCS for your environment. To that end, you have two options to choose
from: Standard Edition and Enterprise Edition. Table 3.1 outlines the key differences between
the two product versions.
Table 3.1 Comparison of Standard and Enterprise Editions
Feature Standard Enterprise
Presence X X
Instant messaging (including
public IM and federation) X X
Conferencing X X
Voice X X
Archiving (off-box) X X
Load balancers X
High availability X
Multiple servers/pool X
Sizing (estimated) 2,000 users 50,000 users
Installing the First OCS 2007 Front-End Server ??? Chapter 3 69
Although we will be generalizing most of our discussion within this chapter to address
both the Standard and Enterprise editions, we will actually be performing an Enterprise Edition
installation. Now that licensing is squared away, the fi rst thing you need to do is verify that
you are at the proper Active Directory level.
Forest/Domain Levels
As you are probably well aware, there are several functional levels of confi guration for an
Active Directory forest and domain. For forests, you can run in:
?– Windows 2000 (supports Windows NT, 2000, and 2003 domains and domain
controllers)
?– Windows Server 2003 interim (supports Windows NT and 2003 domains and
domain controllers)
?– Windows Server 2003 (supports Windows 2003 domains and domain controllers
only)
Similarly, domains have multiple functional levels under which they can function:
?– Windows 2000 mixed (supports Windows NT, 2000, and 2003 domain controllers)
?– Windows 2000 native (supports Windows 2000 and 2003 domain controllers)
?– Windows 2003 interim (supports Windows NT and 2003 domain controllers)
?– Windows Server 2003 (supports Windows 2003 domain controllers only)
For OCS 2003 and the internal certifi cate authority (CA) services to work, you will
need to ensure that both the forest functional level and the domain functional level of your
environment are set to Windows 2003 mode.
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