It’s out!  You can finally migrate a Windows vCenter install to a vCenter appliance VCSA based install using a supported VCSA migration tool!

https://blogs.vmware.com/vsphere/2016/09/vcenter-server-migration-tool-vsphere-6-0-update-2m.html

Just a heads up, here are the requirements:

• It only migrates from Windows installations to VCSA based installations
• It only migrates from 5.5 (any revision) to VCSA 6.0 Update 2
• You must used the embedded database in VCSA
• It will not migrate VUM if VUM is installed on the same OS as your vCenter (no big deal IMO, not hard to reinstall VUM)

Cool things I noticed about this migration utility according to the link above:

• Preservation of original vCenter settings including
  • IP address
  • FQDN
  • Certificates
  • Alarm settings (AWESOME!)
• It doesn’t touch your current vCenter’s stuff, so easy rollback.

Not so cool things:

• You can’t change deployment models during the migration.  A simple deployment in 5.5 becomes an embedded deployment in VCSA, which you don’t want to do, but you can always transition out of that.

I’m sure you’ll be seeing a blog article here kicking the tires on this thing.  But this will definitely help me convince people to go to the VCSA.