From Daniel Spreadbury, Feature & Documentation Manager at Sibelius, I received some very good news about version backwards-compatability in the new Sibelius 3, in contradiction to what I had said about Sibelius 2:
Sibelius 3 is able to save files in a format that allows them to be opened by Sibelius 2 (and, of course, Sibelius 3 can open files from all previous versions of Sibelius). There were too many radical file format changes between Sibelius 1.x and 2.x to make it possible to retain backwards-compatibility when we were working on Sibelius 2, but we took notice of user feedback following its release and took special steps to ensure we would be able to save as Sibelius 2 in Sibelius 3.
Contrary to what those in the industry might assume, this actually makes me willing to upgrade sooner rather than later; I was prepared to wait until the prevalence of version 3 made it absolutely necessary.

Recent Comments
Juhani Nuorvala on What a Guy
Found the untransposed Bed chords: bars 102-108! I interviewed Philip Glass years ago when his ensemble had a gig in...Paul A. Epstein on What a Guy
I still loveTwo Pages and some of the string quartets. And I was recently astonished by Act 2 scene...Allan J. Cronin on What a Guy
I have had the pleasure of meeting Mr. Glass on several occasions and have always found him to be a...James Primosch on The Difficulty of Seeing Music
This is great, I'd never seen this strategy applied to Ives. Really gives you a sense of the geography of...Jim on The Difficulty of Seeing Music
Ron Squibbs (now at UConn) did his PhD at Yale on Xenakis, and his graphs of the scores he studied...Dan Schmidt on The Difficulty of Seeing Music
I remember drawing out a bunch of passages on graph paper, MIDI-piano-roll style, when analyzing Lutoslawski's 3rd Symphony, and getting...Adam Baratz on The Difficulty of Seeing Music
Some similar visualizations: http://www.musanim.com/ .Lyle Sanford on Music’s Quasi-Objectivity
Thanks for this wonderful post. I'm a total amateur when it comes to composing, but found this post very validating,...Erling Wold on Music’s Quasi-Objectivity
I would even agree with the converse of your last statement. If I could justify my ideas of good and...Brian Jennings on Wonkish
Yep, fuck 'em. I wish I understood music writing better. I have frequently found myself having to quit reading books...