Posted 29 March 2017 - 08:05 PM
What kind of email account is it? Is it an IMAP account? If so, then you should just be able to log into account in Outlook in Windows and all your messages should already be there since they are stored on the server. The exception would be an messages that you might have moved to a folder that is only a local folder. If there are such messages, then you just copy them (in Outlook for Mac) back into one of the IMAP folders.
If it is a POP3 account, then one option would be to setup an IMAP account (as most modern email account are), setup that IMAP account in Outlook for Mac, and then move all the POP3 messages stored into Outlook for Mac TEMPORARILY into the IMAP account. Then when you have both the POP3 and IMAP accounts setup in Outlook for Windows, you just copy the messages back from the IMAP folders (that will show up in Outlook for Windows because they are synced to the server of an IMAP account) to the POP3 account folders.