Zoho Mail has a native mobile app designed for iPhone, which is simple, yet powerful to use. Apart from Mail, the app syncs your Calendar and Contacts also, without interfering with your devices Calendars or Contacts. You can download the native app from the App Store.
IMAP
Configure Zoho Mail in Outlook for Windows - IMAP
Steps to Configure Zoho Mail account as IMAP in Outlook for Windows
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