I’m currently working on a project where we implement a new ConfigMgr 2012 hierarchy in a forest where several ConfigMgr 2007 hierarchies already exist. The new ConfigMgr 2012 environment will be installed in a new domain within that existing Forest and we will not migrate any content from these ConfigMgr 2007 environments, but install every client using the OSD functionality of ConfigMgr 2012, but other deployment methods could be necessary for special scenario’s.

Even though this isn’t such a common scenario, I think the results of the test provide some insight on what you can expect in your own migration from ConfigMgr 2007 to ConfigMgr 2012, therefore I decided to share my findings. I hope it will be useful for someone reading this article.

Because one of the requirements for the implementation of ConfigMgr 2012 is that the impact on the existing environment should be as minimal as possible we did some test on what would happen if a ConfigMgr 2007 client would assign itself to a ConfigMgr 2012 environment and possible ways to prevent that.

  • Install a ConfigMgr 2007 client when conflicting boundaries are configured on both ConfigMgr 2007 and ConfigMgr 2012
  • Install a ConfigMgr 2007 client when there is only a boundary group with corresponding boundary defined in ConfigMgr 2012
  • Install a ConfigMgr 2007 client and see what happens when it assigns to the ConfigMgr 2012 site and automatic client upgrade is turned on
  • Install a ConfigMgr 2007 client and see what happens if only a boundary for Content Location in ConfigMgr 2012 is defined.

First there are some known and documented rules which we need to take into account:

A ConfigMgr 2012 client cannot attach itself to a ConfigMgr 2007 site. During Automatic Site Assignment, the ConfigMgr 2012 client will do a version check and when the site it tries to attach to isn’t at the correct level, it will fail to assign to that site.

In order to test the scenario’s, we build the following test environment

ConfigMgr 2007 Primary Site (pss1.nl.domain.local) in the NL child domain, with code N01

ConfigMgr 2012 Primary site (pss2.emea.domain.local) in the EMEA child domain, with site code E01
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