Ampersand Software Applications Limited, Bengaluru, (CHORUS IS AVAILABLE IN TWO DIFFERENT VERSIONS: CHORUS BASIC & CHORUS ADVANCED CHORUS-ADVANCED: CHORUS GOES BEYOND THE FUNCTIONS OF A STANDARD MESSAGING SERVER. CHORUS ADVANCED GIVES THAT EXTRA BIT WHICH CAN MAKE MESSAGING AND MAILING SIMPLER AND SAFER. IT PROVIDES YOU WITH ANTI-SPAMMING AND ANTI-VIRUS OPTIONS TO CLEAN AND PROTECT YOUR MAIL.)