![]() C:\windows\system32>Get-OutlookAnywhere -Server | Set-OutlookAnywhere -ExternalClientAuthenticationMethod NTLM InternalClientAuthenticationMethod : Negotiate Open an Exchange Management Shell: C:\windows\system32>Get-OutlookAnywhere -Server | select *external*,*internal*ĮxternalHostname : ĮxternalClientAuthenticationMethod : Negotiate If you can access the public folder or shared mailbox, then you have to change some settings on the Exchange Server 2013 Client Access Server (CAS). You can change the setting and try the access to a public folder or shared mailbox. With this setting you will have a problem: ![]() I took this screenshots from a Outlook 2013, but it looks the same in Outlook 2010. Check the “Logon network security” settings in your Outlook client. If it’s set to “Anonymous Authentication”, then you experience the in KB2834139 described problem. ![]() This error is caused by a misconfigured Outlook security setting, called “Logon network security”. If you experience this issue, check the “Logon network security” setting. This can be a huge problem during a migration. Either there are network problems or the Exchange server is down for maintenance. The users are constantly prompted for credentials or they get this message: Cannot expand the folder. The same can happen to shared mailboxes (mailboxes with Full Access permissions). When moving users to Exchange 2013 it can happen, that they can’t access public folders housed on the old Exchange 2010 or 2007 server.
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