There is no direct method that allows you to convert MBOX files to Office365. Nevertheless, you could convert MBOX files by opting for a two-step procedure. When we say the two-step approach then the first step you require to follow is converting MBOX files into PST and after that import PST files for easy migration of MBOX into Office 365. This method can be extremely beneficial if you want to move with technology and upgrade features. 

Follow the steps mentioned below to reach one step closer towards MBOX to Office365: 

To start with let us consider your system is installed with Thunderbird Email Client or any other email client that supports .mbox file format for storing email data.

(Note: It is very important to understand that the manual approach is only effective when you require to export only the limited emails from MBOX to Office365) 

Once this entire procedure of dragging the email items gets completed, you would be able to have the clear preview of old emails of Thunderbird from MS Outlook interface. After this, the next key procedure you require to opt is uploading the resultant Outlook PST file data to Microsoft Office 365. 

Pre-requisites to Export PST to Office 365 using Outlook

 

Here are the following steps that are required to be followed before you import pst to Office 365 using Outlook.

Alternatively, as a user you can very effectively create a new role group and assigned a permission to the account. However, you must note that the required Outlook PST file would be imported that stores on network file or file share on local system.

Step 1. Launch AzCopy.exe Network Tool

Initially provide a storage key and upload the URL.

Step 2. Acquire Storage Key and Upload URL

Now, upload secure key and the URL prior to the AzCopy tool in order to further upload the Outlook PST file(s) to Office 365.

Step 3. Upload the PST File(s) to Office 365

Now after you have successfully downloaded and installed the AzCopy tool and acquired the secure key and URL, the respective PST file is required to be migrated.

Step 4: Create the PST Mapping File

Here, you would require to create CSV files to effectively map the PST file to the mailbox in Office 365.

Step 5: Create Office 365 for importing

Localize to https://protection.office.com and once again login with Global Admin account.

Finally, after following all the steps, you can very well check the status through navigating to Office 365 Admin centre and again open the import option. Click on the refresh button to get back the updated status. Click on job and view the details to troubleshoot the status message. This entire procedure of manually migrating data from MBOX to Office 365 can work well only to certain extent but can be troublesome for the users who want to migrate their data quickly. You can overcome these difficulties with the help of a third party tool like RecoveryFix for MBOX to PST Converter. 

RecoveryFix for MBOX to PST Converter 

This software allows you to effectively migrate your mailboxes from different range of MBOX, MBS or MBX supported desktop email clients. The great aspect of the software is its excellent functionality to export MBOX files directly to cloud-based Office 365 mailbox. Also, the utility is well integrated with filter option that in turn allows user to segregate specific items from MBOX file. Adding to that, the software supports all versions of MS Outlook platforms including 2016.

For more information about the software, see : http://www.recoveryfix.com/mbox-to-pst-converter/