Issue:

Some files are continuously uploaded to the server, even when they are not modified.

Resolution:

It is possible that another program is changing the modification date of the file.

If the file is uses the .eml extension, Windows automatically and continually changes all files, unless you remove \HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PropertySystem\PropertyHandlers from the windows registry.

See http://petersteier.wordpress.com/2011/10/22/windows-indexer-changes-modification-dates-of-eml-files/ for more information.