Upgrade NBU from 7.1.0.4 to 7.5.0.6, with some client-server using 7.5.0.6

Hello guys,

Im planning to upgrade my NBU environment, from 7.1.0.4 to 7.5.0.6.

Scenario:

Master Server: Solaris 10. NBU version 7.1.0.4

Media Servers: 6 servers, 2 W2K R2 and 4 Solaris 10. All at NBU 7.1.0.4

Some client servers with 7.5.0.6 (because those are windows 2012) of course I know this is not supported by Symantec, due Master/media are lower than client version. But im just bit courious whats going to be happen, when the upgrade time, with the metadata images migration.

Should I open a Symantec call? Or should I revert the client version to 7.1.0.4? What could be the worst case?

Comments, are very welcome.

Cheers