If you want to fix The process cannot access the file because it is being used by another process error, then worry not, because we have the sauce.

The actual method in the task that does this fails, and msbuild reports: The process cannot access the file 'output.txt' because it is being used by another process.

It was my understanding that I would have to add a file system watcher for each of those directories, versus my current system where I can just add another entry in a database and the next time around ...

Error 0x80070021, Another process has locked a portion of the file appears while exporting the PST file in Outlook. Use these fixes to fix this error.