To merge folders of emails from multiple Outlook accounts.
Open the account to merge from in Outlook. Drag the folder(s) to be merged to the desktop. Should create ".mbox" files. Log into the account to merge into using Mail (version with OS X 10.10 works well). Use Import Mailboxes, Files in mbox format, choose the files. Copy the imported mailboxes onto the server account. That account (with the new folders) will now be accessible from Outlook.
I usually write a blog post about once a week. The latest post can be viewed here: Unity Through Division: Sometimes hard decisions need to be made to make genuine progress. (posted 2024-11-18 at 19:13:00). I do podcasts too!. You can listen to my latest podcast, here: OJB's Podcast 2024-08-22 Stirring Up Trouble: Let's just get every view out there and fairly debate them..