Feature specific compatibility

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Supported POP3 email clients

Quick Heal Internet Security Essentials supports the following email clients.

  • Microsoft Outlook Express 5.5 and later
  • Microsoft Outlook 2000 and later
  • Netscape Messenger 4 and later
  • Eudora
  • Mozilla Thunderbird
  • IncrediMail
  • Windows Mail


  • The Email Protection feature does not support encrypted email connections that use Secure Sockets Layer (SSL).

Feature specific compatibility

  • Browser Sandbox
  • – This feature does not support older version of Microsoft Edge browser of Windows 10 and Windows 11 operating systems and Mozilla Firefox 64-bit.

    – If Strict security level is selected for Browser Sandbox, some websites cannot be browsed on Microsoft Edge browser in some cases. Please make it sure you are aware of the criticality for browsing on Microsoft Edge browser.
  • Quick Heal Self Protection

    Microsoft System Restore will not work if Quick Heal Self Protection is enabled. Before performing System Restore, it is recommended to turn Quick Heal Self Protection off. To turn Quick Heal Self Protection off, follow these steps:

  • – Open Quick Heal Internet Security Essentials.

    – Go to Settings and set Self Protection off.
  • Schedule Scan and Password Protection settings will not be exported when you export it to a file. These settings have to be configured manually after re-installation.
  • Quick Heal Anti-Rootkit is not supported on 64-bit operating systems.
  • Quick Heal Remote Device Management
  • – This feature is supported on Internet Explorer 9 and later.
  • Installation of WinPKFilter (Windows Packet Filter) is not recommended if Quick Heal Internet Security Essentials is already installed on your computer. Installing WinPKFilter on the same machine may result in improper functioning of Quick Heal Internet Security Essentials.
  • An interoperability issue with WinGate Proxy Server may cause system to crash with Blue Screen Error or BSOD if WinGate Proxy Server is installed after Quick Heal Internet Security Essentials installation. It is recommended to install WinGate Proxy Server before Quick Heal Internet Security Essentials installation to avoid the interoperability issue.
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