Hi, Suddenly started to receive Event ID, source MasPerf on an old Exchqange 2003 SP2 box.The description are:The description for Event ID ( 2003 ) in Source ( MasPerf ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: .Anyone have seen this before or maybe know what the problem might be?

Hello Nejmann, The issue can be caused by Masperf.dll, which is a Microsoft ActiveSync performance counters related dll file, is not registered properly in the registry. I suggest running the following commands at a command prompt in the Exchsrvr\bin folder to unload and reload the configuration information and then test the issue again. unlodctr masperf lodctr masperf.ini Related articles: Event ID: 2003 warning messages that are related to performance counters are logged in the Application log on a Windows Server 2003-based computer http://support.microsoft.com/default.aspx/kb/928384 Unlodctr http://technet.microsoft.com/en-us/library/bb491027.aspx Thanks, Elvis

Thank you.