Can MBOX files be opened directly in Outlook 365?
This is a very common question. The short answer is no, Outlook 365 doesn’t support MBOX files directly. Outlook works with only PST and OST file formats. MBOX is a file format that is used by many email clients like Thunderbird, Apple Mail, Eudora, SeaMonkey, etc. Because of this difference, I can’t just drag and drop my old MBOX file into Outlook and I also can't expect it to open directly in Outlook. Nevertheless, people typically deal with this situation in a few indirect ways. One way is to add your Outlook 365 account to an email client that supports MBOX, like Thunderbird or Apple Mail, using IMAP after first setting it up. The messages from your MBOX folders can then be exported or moved into the Outlook/Office 365 mailbox inside the client. The data will sync to your Outlook 365 account because it is connected via IMAP. Another way is users need to export emails from the MBOX-based client into formats that Outlook supports, such as EML files. Dragging all EML file them one by one into Outlook. While this method is workable, it is for smaller mailboxes. It becomes time-consuming with large data. I want a simple know-you suggestion for this conversion process. I know I can get better results on Google but I want that solution that gives 100% assurance to open MBOX files in Outlook.