Exporting Mozilla Thunderbird emails to Microsoft Outlook

Can anyone recommend the best method or program to export Mozilla Thunderbird emails to Microsoft Outlook.

This has to be done on 15+ mailboxes, some as large as 5-10GB and many with subfolders.
I mention this as I know there are manual methords using some free extensions for thunderbird, but this would take too long as there are too many email accounts and subfolders to process.

I'm looking for a program (at a reasonable cost) that can export entire mailboxes into PST format.
leo135Asked:
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RantCanSr. Systems AdministratorCommented:
You can export mail as EML files and then use an add-in such as this to make the conversion.

http://www.outlookfreeware.com/en/products/all/OutlookConvertEML2MSG/#.VbZOwflVhRJ
leo135Author Commented:
As the mailboxes were hosted using Exchange Online (Office 365), I used their imap migration feature and it worked a treat

https://technet.microsoft.com/en-us/library/jj874015%28v=exchg.150%29.aspx

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leo135Author Commented:
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