Open-E provides for free: 'updates' within one version!
Improving quality, removing bugs, adding some functionality, etc
This is why, we were never charging for updates within DSS v.5 or
iSCSI-R3... etc.

'Upgrade' is usually related to creating a new product!
Similar to other software manufacturers:
windows 2000 -> windows xp,
adobe cs2 -> adobe cs4
vmware vs3 -> vmware vs4
oracle 10 -> oracle 11
etc, etc...

Open-E does charge when deliver a major (!) change in technology, additional
functionality, different interface, installation media,...
Such upgrade charge is nothing new at Open-E, we did it in past by major
technology changes as well:
NAS -> NAS-XSR
NAS-XSR -> DSS
DSS -> DSS V6

Sorry for inconvenience caused.