From my archive notes: 10/25/2012

While trying to integrate an Avaya IP Office into Exchange 2007 I found that there was no "Unified Messaging Server Role" service installed. So I went to the control panel to change the install for Exchange Server 2007 to enable that Role. Two address paths were defined when adding this service.

First for the Exchange Server installation files:
C:\Program Files\Windows Small Business Server\Bin\CMPNENTS\EXCHSRV80

Second for the Exchange Server installation path:
C:\Program Files\Microsoft\Exchange Server

Our server did not have any folder located in the default installation files path and I didn't have my Exchange server install CD handy. Looking at several guides online, users have complained that using the original files from their install CD caused issues. So I went online and found the latest service pack that I had installed and decided to extract the files from there. Turns out I had Exchange Server 2007 Service Pack 1 (x64) installed.

I was able to download the "Exchange Server 2007 Service Pack 2" files from here:
http://www.microsoft.com/en-us/download/details.aspx?id=4479

The exe file was about 884 MB. After extracting the file using WinRAR, the file size was about 1.22 GB (now I can see why the files were not on my server). At one point or another, a previous tech had cleared out these files to save space on the server. From my workstation where I extracted the files, I opened the shortcut to my server and copied the files to the C:\Program Files\Windows Small Business Server\Bin\CMPNENTS\ under a new folder named "EXCHSRV80"

I decided on waiting a couple of days for the weekend as I didn't want to take the server down for updates in the middle of the workweek...

Notes and Resources:
http://social.technet.microsoft.com/Forums/en-US/exchangesvrclients/thread/64a9409a-e57a-4431-932e-b1426a17f66e