MailsDaddy OST to Office 365 Migration Tool is a popular cloud migration solution to upload OST file to Office 365 without Outlook. Offers Simple, Secure and Reliable way to import Exchange Server, IMAP, or Hotmail OST file to Office 365 (Exchange Online) account. It also acts as an OST recovery solution repairing damaged OST file. It also provides an instant preview with its complete information. Move OST file to Office 365 OWA user mailboxes with or without Impersonation rights. Capable to keep the meta-information of each PST item preserved. Compatible to convert the OST file of Outlook 2019, 2016, 2013, 2010, and all other previous versions.