I have been troubleshooting a problem i had recently with the umworkerprocess not starting. i cam across a microsoft article
http://technet.microsoft.com/en-us/library/bb218800.aspx saying that the umconfig.xml file could be missing. i checked this and it was indeed missing. The resolution was to copy from the install media, but it was missing from there also. We even redownloaded the Exchange 2007 SP1 ISO and it was not there either. Has anybody came across this problem? I believe that this missing file could be the resolution to my problem, but cannot tell for sure since i cannot get a copy of the file.