In this article · 8 sections
Office computers hold accounts, customer data and access to bank portals. One infected PC can lead to stolen passwords, fraud or ransomware that locks every file. Choosing antivirus for small business is important, but tools alone aren't enough. Updates, permissions and staff habits matter just as much.
Is built-in protection enough?
Microsoft Defender, built into Windows 10/11, provides solid baseline protection when kept updated and turned on. For many very small offices, Defender plus good habits is a reasonable starting point.
Consider paid endpoint security when you need: - Central management of all office PCs from one dashboard - Alerts when a device is infected or out of date - Web filtering and device control (USB blocking) - Ransomware rollback features - Protection for Macs and Android devices too
Many well-known vendors offer small business plans; Microsoft also offers business versions of Defender with central management through Microsoft 365. Compare current plans and reviews from independent test labs.
Protection checklist for every office PC
- Antivirus on and updating automatically
- Windows and software updates installed promptly; old, unsupported Windows versions replaced
- Staff use standard accounts, not administrator accounts, for daily work
- Firewall on
- Disk encryption on laptops (BitLocker)
- Browser updated, with only necessary extensions
- No pirated software: cracked software is a common malware source
- Screen lock after a few minutes of inactivity
Email and phishing
Most attacks start with an email or WhatsApp message: a fake invoice, courier notice or "urgent" payment request.
- Don't open unexpected attachments, especially .zip, .exe or macro-enabled Office files
- Verify payment change requests by phone
- Use business email with good spam filtering. See business email setup
Ransomware: plan for the worst
- Keep offline or immutable backups. See the 3-2-1 backup rule
- Limit shared folder access to people who need it
- If infected: disconnect the PC from the network immediately and call your IT support
USB drives and downloads
- Scan USB drives before opening files
- Consider blocking USB storage on PCs with sensitive data
- Download software only from official websites
Passwords and logins
- Use a password manager
- Turn on two-factor authentication for email, banking and cloud accounts
Website security is separate
Office antivirus doesn't protect your website. Websites need updates, secure hosting, backups and monitoring. See cybersecurity tips for small business websites.
FAQs
Do Macs need antivirus?
Macs are less targeted but not immune. Keep macOS updated and consider endpoint protection in business settings.
Is free antivirus fine for business?
Check the licence; many free consumer products don't allow commercial use. Defender is included with Windows.
Joboo Web keeps client websites secure with updates, backups and monitoring. Ask about website maintenance.