I have vCenter 5.0 running on WIndows 2003 R2 HP Proliant DL380 G4 server. We have small environment, just 4 ESXi hosts and 50 VMs so I am using MS SQl 2005 Express.
I would like to upgrade vCenter to version 5.5
Windows 2003 R2 is not supported for vCenter 5.5. HP DL380 G4 is not supported/certified for Windows 2008 R2.
It looks like my only option is to install fresh vCenter 5.5 on Windows 2008 R2 on new hardware. 
Is there any other options? is it possible to migrate database or any other settings from my vCenter 5.0 to a new vCenter 5.5? How to make upgrade process less painful?
Thank you for your help and advice!