How can I convert my email store from Microsoft Outlook 2011 for Mac to the Windows version?

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Switching from Outlook for Windows to Outlook for Mac is quite easy, but switching in the other direction appears to be much harder.

I have downloaded email files in Outlook for Mac that I need to import to Outlook for Windows. The main issue is that I have deleted all the mails from the server and have saved the emails in Outlook 2011. Now, uploading these emails is taking ages and I am running out of time. How can I transfer all these files from outlook 2011 for Mac to Outlook 2013 for Windows???

Helpful answers will be really appreciated.

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