WebDAV Login Issues
If the user account has been configured to Require password change on next login then WebDAV login will not succeed until the password has been changed. Ask the user to access Files.com using our web interface and have them complete the password change prior to attempting a login via WebDAV.
If a user is having problems logging in using WebDAV then have them attempt to log in using the Files.com web interface. If the issue persists there then this eliminates WebDAV as the cause.