This is the hit count for a specific entry in the POP3-specific top-viruses table. Tracking this count for the POP3 vector specifically helps the admin judge whether migrating remaining POP3 users to a more centrally filtered mail platform would meaningfully reduce malware exposure, separate from web, FTP, or SMTP activity. For example, this count staying persistently higher than the SMTP equivalent would suggest POP3 users are a disproportionate source of malware exposure worth prioritizing for migration.