No Access to modern Public Folders (Exchange 2013) from Windows XP

Hi there,

i tried a lot and did a lot of research so i just want to share that information. When you try to open the Public Folders from XP Client you receive:

Windows 7 works fine.

The Mailbox it self works fine, Outlook 2007 or 2010 (patched) makes no difference, Autodisdover works fine.

Regkey for XP is allready set:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa]
"lmcompatibilitylevel"=dword:00000003

Auth is set to NTLM.

We found this:

1. Critical: 12/4 Outlook (all version) on Windows XP cannot access Exchange 2013 CU3 modern Public Folders, when their mailbox is on 2013 CU3 server
   • Only critical if you have Windows XP clients, which many organizations still do
   • Workaround: Have users use OWA or W7+ workstation

http://blog.jasonsherry.net/2013/11/25/exchange-2010-sp3-ru3-2013-cu3-released/

-> We have a Support-Case running and ill update you.