I have started to migrate Apple users who use Apple Mail with IMAP or POP3 to Office 365. What would people recommend when migrating emails from "On my Mac" to the Office 365? I have had a issues where not all the emails have moved.
I would guess the "on my mac" folder is an indication that the mail is held locally rather than in the cloud/on a server. Most likley this was mail that was downloaded in a POP3 setup.
If that is the case, it would completely make sense that you are not having that mail migrate following traditional means, as traditional means of migrations typically are just coping the mail from your old mail server.
If you are going to continue to use the same computers and mail systems, when you setup your new O365 boxes, you can just import the data back as Mbox files. If are moving away from Mac, it gets more complicated and you may need to do a multi-pronged approach such as something like this - https://gallery.technet.microsoft.com/Learn-How-to-Import-MBOX-40f45897
the first thing which a user requires to do is export mailbox items from Apple Mail to Local account. When you receive Mac Mail folders and other mailbox data items as MBOX file format, you can use MBOX to Office 365 software, which offers a direct method to upload or import Apple Mail files to Outlook web app account. To perform the task just follow these provided steps:
First learn How to Extract MBOX Files from Apple Mail from here.
Download Apple Mail to Office 365 Migration Tool from the below given button
Launch and open this tool on your PC.
Now, load Mac Mail files by selecting Add File(s) or Add Folder option and click on Next.
Choose With Impersnation or Without Impersonation option according to your need for migrating Apple Mail emails into Office 365 account.
If you choose With Impersonation option – then you only necessity to add the login credentials of your Office 365 admin account. And the login ID of different accounts presented in exact admin account. So Mac Mail data files can be exported in a required user account.
If you choose Without Impersonation option – then you require to add the ID and password of every mailbox or user one by one where you want to save the Apple Mail data.
Now, click on Export to star the conversion progress from Mac Mail to Office 365 and check live progress status of Apple Mail mailbox to Outlook 365.
Once, the conversion is finished, an alter window will display that is showing the message of “Conversion Completed”. Press on the OK to accomplish the procedure.
As you can see that any type of user can precisely and effectively perform Apple Mail to Office 365 Migration and easily learn how to migrate Mac Mail to Office 365 webmail just by following the above-mentioned steps.