Migrated Exchange 2010 to Office 365 and INTERNAL users only now cannot see and of the Migrated Public Folders.
Manually created the Public Folder mailbox, and Public Folder root directory. Assigned all rights needed to a user group.
Copied up subfolders to be individual Public Folders under root.
Migrated user accounts using BitTitan MigrationWiz (didn't use their Public Folder migration option, just mailboxes).
Outlook 2010 users will see the Public Folder top level tree, but get a "Cannot display the folder. Microsoft Outlook cannot access the specified folder location." when clicking on the ALL PUBLIC FOLDERS line. Names of the real custom folders do not display.
Some Outlook users don't see the Public Folder tree at all in Folders view.
Also using Outlook 2016 and 2013 which don't work any better.
If I connect from outside the network using Outlook 2010 or Outlook 2016, everything works correctly.
I've changed the internal DNS autodiscover record to match the external DNS record and flushed the DNS. Also tried setting DNS to 188.8.131.52 and recreating profile. No luck.
It seems like it's still looking for the premises Public Folders and not the Office 365 folders.
Any help appreciated!