MAPI_E_FAILONEPROVIDER (0x8004011d) after installing Windows Server 2003 SP2

Sorry for the duplication, I'm just rebranding an earlier post of mine because many people have never heard of SNP and may discount the post due to the title. If you are getting MAPI errors because of RPC connectivity problems, and you have SP2 installed for Windows Server 2003, this is probably what's affecting you, especially if you have a Broadcom NIC.

https://blogs.msdn.com/pcreehan/archive/2007/10/16/ooh-snp.aspx