PRICING IS PER USER, PER YEAR. TAXES NOT INCLUDED.
You can additionally purchase an Anti-virus Extension for $2 per user, per year; an Anti-spam Extension for $2 per user, per year; and an ActiveSync Extension for $3.50 per user, per year.
Anti-spam extension checks incoming emails for spam.
Antivirus extension checks incoming emails and attachments for malware.
ActiveSync extension lets mobile phone users access their email, calendar, contacts, and tasks, and lets them continue to access this information when they're working offline.