The ease of the upgrade depends on many things. The type of servers you have, 
number of clients, etc.
You'll want to look at the HCL & find out if your hardware meets the minimum 
requirements for NBU 7.x.
Windows 2000 is no longer supported, neither are several 32 Bit OS's.

It seems most eveyone uses NBU in a different way. We have separate 7 NBU 
masters with about 400 clients, theres a few media servers in there too. The 
beginning was rough, but working with Symantec support we forged through and I 
can tell you the experience (for what it's worth) was better than going from 
5.x to 6.x.  Pay attention to the amount of free disk space you have, you'll 
need plenty.

Cheers,
Rick

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