title: Excel cannot see Windows mapped drive when running under a service
body: <p>I have an application that runs as a service.  This application allows the user to connect and starts a subprocess under the user's windows account.  In other words, mydomain\john connects to the service via TCP and says "launch" which starts a process on windows running under mydomain\john account.</p>
  
  <p>Next, this subprocess is able to map drive T: using net use command.  Then the process can run a VB script living on the mapped drive T:.  No trouble so far.  the problem arises when this VB script tries to run Excel using "createObject".</p>
  
  <p>After setting DCOM launch settings with DCOMCNFG and creating the missing "Desktop" folder in the systemprofile folder, I still cannot get this to work.  Oddly, if run my vb script and feed Excel a UNC path \fileserver\share1 rather than T:\ the script works.</p>
  
  <p>Does anyone know why Excel would fail to access the T:\ mapping but have no issue with the UNC path?</p>