Public Folders in hybrid deploymen

Hi,

I'm working on a hybrid deployment (fully patched on premise exchange 2013) to have a smooth move to exchange online. Atm I can move users to the cloud and the normal mail flow is running. Everything is fine so far.

The next steps will be:

1. Make public folders usable for online and local users and leave pf local.
2. Move all users in the next weeks to the cloud
3. Move public folders to the cloud
4. Uninstall on premise exchange

Ok, tried to work with that: https://technet.microsoft.com/en-us/library/dn986544(v=exchg.150).aspx

But... I got some questions:

Step 1: When I allready got public folder mailboxes: Why should I make new one? Is this on premise? Or do I have to make them in exchange online?

If I don't need to make new PF: Step4: Did that and I get from outlook a conflict that they couldnt access the server with the public folders.