In previous parts of this guide we’ve setup MDT 2010 and have it configured. Now it’s time to add WSUS integration to automatically install the latest patches while deploying Windows 7.
Install WSUS
First download and install WSUS 3.0 x64 version or WSUS 3.0 x86 version (for Server 2003), or add the WSUS server role of you’re on Server 2008:

The WSUS installation window is underneath the Server Roles window, use alt-tab or the taskbar to proceed with the installation.

Configure WSUS to your needs:

Enable WSUS for Task Sequences
Update each Task Sequence you want updates installed through WSUS. By default ‘Disable this step’ is checked, to enable WSUS for this TS just remove the check:

Update CustomSettings.ini
Add WSUSServer to your CustomSettings.ini:
WSUSServer=http://wsusServerName
or
WSUSServer=http://wsusServerName:portnumber
Depending on your WSUS configuration.
Configuration is done, time to deploy a Win 7 client.
After the image is applied, Windows Update is doing its job using our WSUS server:

Just to make sure, take a look at the Installed Updates on the newly deployed client:

WSUS integration succeeded!
Please find other parts here:
Windows 7 Lite Touch installation with MDT 2010 – Part 1
Windows 7 Lite Touch installation with MDT 2010 – Part 2
Windows 7 Lite Touch installation with MDT 2010 – Part 3