most of the labs (the 3 first out of 4 courses) of this collection cannot be used to practice, because the certificates necessary for using the Office Communicator 2007 have expired in 2008.
Please contact Alicia at learnmgr@microsoft.com to discuss this issue further and she will be happy to put you in touch with the team that supports this issue.
Thanks, Tagore
Proposed as answer byTagore BandlamudiMonday, March 23, 2009 7:17 AM