ISO best steps to export (import) all from Outlook 2003 to Outlook in MS 365

Sep 15, 2013
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I've been using Outlook 2003 on an XP machine for probably 14 years for my two or three personal email accounts, of which the most important is [myname], which is now hosted by AOL. On that and another important email account, my Outlook 2003 is set for POP3 with "Leave a copy of email on the server".

My .pst file is huge, but I want to save it and have it usable when I move everything to Outlook in MS 365 on a Win 10 Pro 64-bit machine.

1) So, what are best steps to "export" from the old Outlook2003/XP to the new Outlook365/Win 10 (or to "import" the old Outlook2003/XP to the new Outlook365/Win 10)? So all my old emails are available in the Outlook365/Win 10.

2) Also, ideally. I want the Inbox on the new Outlook365/Win 10 to be a "unified" Inbox (as I have on the old Outlook2003/XP) that shows all incoming email from my three email account in a single Inbox and remembers which account to use when I reply.

It's so easy to do this wrong. What are the steps to do this right?


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