No major differences in this field.
There is only a small difference between experiencing Auto Mail Sender on WinXP and Vista/Win7 as below:
Auto Mail Sender does not support selecting recipients from the Windows Contacts for Windows Vista/7 currently. Usually, AMS users select recipients from the csv/txt/xls/xlsx files, so you can export your recipients from Windows Contacts to the csv file and select recipients from the exported file.
