VMware vCenter Standalone Converter platforms support goes almost with the vSphere version, so if you need to support vSphere 6.0, you will need the Converter 6.0 version.
But for the supported guest OSes it could become more complicated, because new version add new OSes, but also remove the old OSes (no more supported by the vendor).
So, if you need to converter an old OS you probably need an old version of the vCenter Standalone Converter (note that the 3.0.3 is not so easy to be downloaded from the VMware site). Also because your vSphere platform may be not supported you have to save the conversion in an intermediate Workstation/Fusion/Player file format and then re-import again with a more recent version of Converter (or manually register the VM file, if you have choose a right format for the vmdk).
This table summarize the compatibility list for the different type of Converter and the different type of guest OSes:
| Converter 3.0.3 | Converter 4.0.1 | Converter 4.3 | Converter 5.0.1 | Converter 5.1.2 | Converter 5.5.3 | Converter 6.0.0 | |
| Windows Server 2016 | No | No | No | No | No | No | No |
| Windows Server 2012 R2 | No | No | No | No | No | No | Yes |
| Windows Server 2012 |
No | No | No | No | Yes | Yes | Yes |
| Windows Server 2008 R2 | No | No | Yes | Yes | Yes | Yes | Yes |
| Windows Server 2008 (32 and 64-bit) | No | Yes | SP2 | SP2 | SP2 | SP2 | SP2 |
| Windows Server 2003 R2 SP2 (32 and 64-bit) | No | No | Yes | Yes | Yes | Yes | Yes |
| Windows Server 2003 (32 and 64-bit) | Yes | Yes | No | No | No | No | No |
| Windows 2000 Server (32-bit) |
Yes | SP4 | No | No | No | No | No |
| Windows NT 4.0 (32-bit) | SP4 | SP6 | No | No | No | No | No |
| Windows 10 (32 and 64-bit) | No | No | No | No | No | No | No |
| Windows 8.1 (32 and 64-bit) | No | No | No | No | No | No | Yes |
| Windows 8 (32 and 64-bit) | No | No | No | No | Yes | Yes | Yes |
| Windows 7 (32 and 64-bit) | No | No | Yes | Yes | Yes | Yes | Yes |
| Windows Vista (32 and 64-bit) | Yes | Yes | SP1 | SP2 | SP2 | SP2 | SP2 |
| Windows XP Pro (32 and 64-bit) | Yes | Yes | Yes | SP3 | SP3 | SP3 | No |
| Windows 2000 Pro (32-bit) | Yes | SP4 | No | No | No | No | No |
| Red Hat Enterprise Linux 7.x (64-bit) | No | No | No | No | No | No | Yes |
| Red Hat Enterprise Linux 6.x (32 and 64-bit) | No | No | No | No | Yes | Yes | Yes |
| Red Hat Enterprise Linux 5.x (32 and 64-bit) | No | 5.0 | No | Yes | Yes | Yes | Yes |
| Red Hat Enterprise Linux 4.x (32 and 64-bit) | No | 4.0 | 4.0 | Yes | Yes | Yes | Yes |
| Red Hat Enterprise Linux 3.x (32 and 64-bit) | No | 4.0 | 3.0 | Yes | Yes | Yes | No |
| Red Hat Enterprise Linux 2.x (32 and 64-bit) | No | 2.1 (32 bit) | 2.1 (32 bit) | Yes | No | No | No |
| CentOS 7.0 (64-bit) | No | No | No | No | No | No | Yes |
| CentOS 6.x (32 and 64-bit) | No | No | No | No | No | No | Yes |
| SUSE Linux Enterprise Server 11.x (32 and 64-bit) | No | No | 11.0 | Yes | Yes | Yes | Yes |
| SUSE Linux Enterprise Server 10.x (32 and 64-bit) | No | 10.0 | 10.0 | Yes | Yes | Yes | Yes |
| SUSE Linux Enterprise Server 9.x (32 and 64-bit) | No | 9.0 | 9.0 | Yes | Yes | Yes | Yes |
| SUSE Linux Enterprise Server 8.x (32 and 64-bit) | No | 8.0 | 8.0 | Yes | No | No | No |
| Ubuntu 14.x (32 and 64-bit) | No | No | No | No | No | No | Yes |
| Ubuntu 13.x (32 and 64-bit) | No | No | No | No | No | Yes | No |
| Ubuntu 12.x (32 and 64-bit) | No | No | No | No | Yes | Yes | 12.04 |
| Ubuntu 11.x (32 and 64-bit) | No | No | No | No | Yes | No | No |
| Ubuntu 10.x (32 and 64-bit) | No | No | 10.04 | Yes | Yes | 10.04 LTS | No |
| Ubuntu 9.x (32 and 64-bit) | No | No | Yes | Yes | No | No | No |
| Ubuntu 8.x (32 and 64-bit) | No | Yes | Yes | No | No | No | No |
| Ubuntu 7.x (32 and 64-bit) | No | Yes | Yes | No | No | No | No |
| Ubuntu 6.x | No | Yes | Yes | No | No | No | No |
| Ubuntu 5.x | No | Yes | Yes | No | No | No | No |
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Andrea Mauro
Virtualization, Cloud and Storage Architect. Tech Field delegate. VMUG IT Co-Founder and board member. VMware VMTN Moderator and vExpert 2010-24. Dell TechCenter Rockstar 2014-15. Microsoft MVP 2014-16. Veeam Vanguard 2015-23. Nutanix NTC 2014-20. Several certifications including: VCDX-DCV, VCP-DCV/DT/Cloud, VCAP-DCA/DCD/CIA/CID/DTA/DTD, MCSA, MCSE, MCITP, CCA, NPP.
