Q: I need to get some notation files that are in Finale into Sibelius. Is there an easy way to do this?
A: Sibelius 5 will directly open .mus Finale 98/2000 files. For Finale 2001 or later, Sibelius will open .etf files.
Another option is to save a standard MIDI file from Finale, then import that into Sibelius. With this option, you will have to completely re-create any notation editing/massaging you have done.