The DocWiki continues to state this has not been tested and will not be supported by TAC in the 1.5 release. Have them install ESXi 5.1 on the host(s) used for CWMS and spin up a small vCenter 5.1 instance for the near-term.
Also, CWMS 2.0 is scheduled to ship in the near future. Keep an eye on the DocWiki and the product release notes for any updates on this front once it does.
Please remember to rate helpful responses and identify helpful or correct answers.
Message was edited by: Jonathan Schulenberg to correct vCenter version requirements. CWMS 1.5 does stipulate vCenter 5.1 in the release notes.