Running rsync doesn't give desired results

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http://serverfault.com – I have a linux box that has a Windows 7 share mounted. The Linux box has a cron job to copy the contents of the Win7 share to another location on the Linux box -- a backup. The script run is simply rsync -a etc.... I have another Linux box outside the LAN that runs the same rsync command between the Linux box in the LAN back to the Linux box outside the LAN -- a second backup. The problem is that the rsync command doesn't seem to update files that have changed since the last run of rsync. I have a file that I know has changed on the Windows box that, on the Linux boxes, is still an old ve (HowTos)