I am consolidating some SQL Servers to simplify administration. I am thinking about a new VM with SQL Server 2005/2008R2/2012 each as a separate named instance on the same machine. This machine will only be used in a 'sandbox' environment primarily to test restores of our backups. No applications will be hitting this.
Am I likely to run into any issues with multiple versions? I remember running into issues years ago with SQL 2000/2005 on the same box. Do you folks use separate machines for restore testing?