We have a third party software which is accessing the mailboxes via MAPI. Now I have the MAPI_E_FAILONEPROVIDER == 0x8004011D error on my Exchange 2010 SP3 when I try to access the mailbox via MFCMAPI. I can access the Public Folder Database, but not the specific mailbox. The user is a domain admin account. The software worked before with Exchange 2010 SP1. The software developer was already remote supporting and concluding it is a Microsoft issue. I already tried to set "Ignore No PF" DWORD under HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Messaging Subsystem\CDO. But this has no result. Besides we have public folders.
I already installed all UR patches and still no luck. Any help would be appreciated.