The Unofficial Sibelius Wiki - your source for tips and tricks to the worlds very best music notation software!
06/09/2010 - SIBELIUS 6.2 - WIKI software updated - Announcements

Getting Help

If you have problems installing Sibelius, you should look at Installing and Registering.
In general, the fastest way to get help is on the official pages, you can find them on the links page.
It is always advisable to RTFM, but in this case the manual is actually pretty good (and pretty funny).