For more information about the Toolbox, see Managing Tools in the Toolbox.
Contents Computers running Outlook 2003 and earlier or Microsoft Entourage require a public folder database (previously called the public folder store) to connect to Exchange.
Therefore, in a pure Exchange 2010 organization, as you install the Mailbox server role on the first server, Setup prompts you with the question: Do you have any client computers running Outlook 2003 and earlier or Entourage in your organization?
Public folders aren't designed for the following purposes: In Exchange Server 2010, public folders are an optional feature.
If all client computers in your organization are running Microsoft Outlook 2010 or Office Outlook 2007, there are no dependencies on public folders for features such as free and busy information and offline address book (OAB) downloads.
If so, and after the Exchange upgrade, you can reinstall Outlook 2016 for Windows.