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After installing Windows NT 4.0 Service Pack 4 (SP4) and the subsequent Exchange Server 5.5 SP2, our client had a strange problem. When a user sent messages from Outlook 9x or Outlook Web Access (OWA) to any POP3 or Internet Message Access Protocol 4 (IMAP4) user, the message appeared with no sender ID or subject, and attachments were embedded in the body of the message (and not properly seen as attachments).
The problem was in rnr20.dll. After obtaining a new rnr20.dll file from Microsoft, we stopped Exchange Server and other dependent services and replaced the DLL. Then, we edited the HKEY_LOCAL_MACHINE\SYSTEM\ CurrentControlSet\Services\Tcpip\Parameters Registry key by adding the Value Name UseIPStackAddress, Data Type REG_WORD, Value 1. With those changes, the problem disappeared.
The Microsoft article "Exchange Protocols Fail After Applying Windows NT 4.0 SP4" (http://support.microsoft.com/support/kb/ articles/q214/8/64.asp) provides more detailed information. Microsoft Product Support Services (PSS) told us they have seen this problem in installations where a RAS server is also running on the Exchange server. Lightweight Directory Access Protocol (LDAP) directory lookups against the Exchange directory also failed. I hope this tip will save someone else some grief.
Update on Bluecurve's DMM
Since the publication of the article "Tips for Interpreting Benchmarks" in the April issue, Bluecurve has made Dynameasure/Messaging (DMM) available at no charge. Microsoft's decision to exclusively audit and approve hardware vendors' LoadSim MAPI Messaging Benchmark (MMB) performance scores and not those derived from Bluecurve DMM has prompted Bluecurve to refocus DMM as an add-on workload for Dynameasure instead of a vendor-targeted benchmark. Users can download the Standard Messaging Workload for free from Bluecurve's Web site at ftp://ftp.bluecurve.com/support. An Intel technical paper at http://www.intel.com/procs/servers/ performance/docs/dmm.pdf describes the use of the Standard Messaging Workload to compare a Pentium Pro processor with a Xeon processor.