Getting started

http://msdn.microsoft.com/en-us/library/ee943321.aspx

Create lab environments

http://msdn.microsoft.com/en-us/library/dd380688.aspx

SCVMM managed environments

http://msdn.microsoft.com/en-us/library/ee830480.aspx

Network isolation

http://msdn.microsoft.com/en-us/library/hh329474.aspx

Troubleshooting guide

http://msdn.microsoft.com/en-us/library/ee853230.aspx

Lab manager blog posts archive

http://blogs.msdn.com/b/visualstudioalm/

No, environments cannot be shared across multiple team projects. You will have to recreate the environments (with same nodes) in another team project, once you have deleted the environment from the previous one. A machine can be part of only one environment across team projects.

There is limited support for managing environments in Azure. There are a couple of blogs posted about this here and here 

No. Lab manager can only manage nodes running windows OS.

You can use the tfsconfig lab /delete command, to delete hosts and environments from a team project collection. Please refer to http://msdn.microsoft.com/en-us/library/ee712732(v=vs.100).aspx

You can manage environments across owners via the tfs/project admin user account.

http://social.msdn.microsoft.com/Forums/vstudio/en-US/0570b003-9e99-4758-8c79-352dd72a988f/error-installing-test-agents-for-lab-management-2012

For a standard environment or composed environment, It will not delete your lab machine. For a provisioned environment (Using Template, Library VM), It will delete lab environment

It tries to access deployment path with “Lab Service account”, if it fails then uses “Lab Agent Service” service account for running the deployment task, which is by default “Local System Account”.

This can happen if UAC is not disabled, please refer the below blog for details

http://blogs.msdn.com/b/visualstudioalm/archive/2012/06/13/creating-team-foundation-server-2012-lab-management-standard-environments-and-getting-error-verify-that-the-machines-are-accessible-using-the-user-name-and-password-provided.aspx