If you don't know how to import OST to an IMAP account, here I recommend you the best software for this problem called eSoftTools OST converter software. Use the OST Conversion Tool to move data from Outlook to IMAP-based applications quickly and easily. This is one of the best tools available on google at this time for doing this migration task instantly. This software is 100% safe and very easy to use for all technical users and non-technical users. It supports migration from OST to all IMAP based email applications including- zoho mail, yahoo mail, Gmail, GoDaddy mail etc.