Move emails older then x years to different mailbox in Outlook / Office365

Question

I have a 50GB mailbox at Office365 which is almost full, and just created a second one to be used as archive. I want to archive all emails older then x years to the second mailbox and keep the folder structure.

The online archive is not an option, as I need all email to be available offline as well.

I have access to both Outlook 2016 for Mac and Windows.

The only way I can think of is setting up archiveing to a PST in the Windows based Outlook version and import that PST to the second mailbox

What are my options?

Answer 1

1. You can use the Exchange PowerShell to move old emails to PST file and then import the PST to a new mailbox (New-MailboxExportRequest and New-MailboxImportRequest cmdlets). This is only if you have the access to remote powershell session.

2. You can use the Merge Outlook Stores to move all emails at once. Just click the Configure button, select the source mailbox, then specify the new mailbox as a destination, set "Move source items..." option and specify required date range. I recommend this tool because I'm one of the developers.