Earlier, I wrote on a new technet article that details migration to Office 365 groups from on prem public folders. Actually walking through that I noticed some inconveniences I figured I could improve on with a script. The main one being that the endpoint in Office 365 only supports a single Public Folder, excluding child folders.

So I wrote up a script (with resume support) that will map your Public Folders to O365 Groups and migrate them in as many batches as are required, fully automated.

You’ll end up with a nice csv file with all the details. Note:

1. this script expects you to know what you’re doing!
2. only tested with Exchange 2010 as source
3. everything on prem is left untouched
4. groups are not mail enabled, and security settings are not copied
5. contacts are not copied
6. make sure you read the code/in-script instructions between line 1 and line 48, and then if you’re curious, from line 71720

https://gitlab.com/Lieben/assortedFunctions/blob/master/archivePublicFoldersToOffice365Groups.ps1

update 05/01: improved the connection status check + reconnect for remote ExO and fixed report file path auto generation

update 11/01: moved everything to start-job so exchange sessions are always isolated (no prompting after 1-2 days) and added total migration overview display 

update 25/01: exported the remote exchange module and added it as inline code with a modification so it won’t prompt for credentials, nothing else seems to otherwise prevent such prompts. This means the module may not match Microsoft’s if they update Exchange Online. Let me know if that causes issues for you or re-create it yourself with export-pssession and replace.