BUZZ-Sage: worst day in 25 years after rev guidance cut
** British software firm Sage Group (LSE: SGE.L - news) 's shares down c15 pct, on track for worst single day in 25 years, after trimming organic rev guidance
** Co trims full-year organic revenue growth forecast to 7 pct from 8 pct citing slower software subscription growth in H1
** Sage still needs to accelerate organic growth towards c. 8 pct in H2 to meet the new guidance and off slightly tougher comps - MS; rates "underweight"
** Bottom of Stoxx 600 & most actively traded stock on index; also bottom of FTSE 100