There are various tools available for the users to migrate mailboxes from source IMAP to office365 server. But, I recommend EdMails IMAP to office 365 Software particularly designed to work in multiple domains and allows the users to migrate IMAP to office365/ Exchange server effortlessly. The tool compatible with all IMAP email servers like Google mail - Gmail, Outlook.com, Office365.com, Yahoo Mail, Yahoo Mail Plus, Yahoo Mail UK, Yahoo Mail, Etc., both technical and non-technical can easily access this tool without any technical skill. The tool is well developed with some amazing features which can efficiently migrate all IMAP emails to office365.
• Simple and user friendly Tool.
• Migrate emails from all IMAP servers to Office 365 or Exchange Server.
• Automatic mailbox mapping between IMAP to O365/ Exchange server.
• Supports specific folders or emails migration from source IMAP to target server.
• Supports incremental migration to avoid duplicate items migrations to the target server
• Automatic mailbox mapping to the destination server.
• Migration includes personal, archive, shared and public folders.