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BTW, now that I know what it is, I found some references that say it is "very amenable to pruning" and can be pruned just about any time:
"if you cut an old pittsporum back in mid
summer, regrowth will be very slow. If you
cut it back in fall or spring, regrowth will
be more rapid and successful"
(from http://patwelsh.com/wpmu/blog/trees/pruning-victorian-box/)