I have customers still using Virtuozzo 3.0, and didn't want to chance breaking them with an upgrade. The release notes state that you should upgrade to Virtuozzo 4.7 before upgrading PBAS. Is that a requirement? Or will it continue to work with Virtuozzo 3.0? I would prefer to remain on 3.0. In fact, I'm not sure I can find the licenses I was emailed for 2 nodes to upgrade them to 4.x since it was so long ago. PBAS has been working fine with it. I'm currently on PBAS 4.1.5 and getting ready to upgrade to 4.2.3, but the Virtuozzo compatibility would throw a wrench in it... I'm also looking to upgrade to the latest Plesk (still on 9.5) to get the new sitebuilder, but that first requires the new PBAS. So would it be possible to upgrade PBAS and leave the Virtuozzo containers alone?