[gora]

Код:

@Echo Off
Set input=MAIL
Set output=SentMail
Set ext=rar zip

For /F "UseBackQ Delims=" %%I In (`Dir "%input%" /B 2^>Nul`) Do For %%K In (%ext%) Do If /I "%%~xI"==".%%K" Call :_copyF "%%I"
Exit
:_copyF
Set cn=
:_loop
If Exist "%output%\%~n1%cn%%~x1" Set /a cn+=1& Goto _loop
Copy "%input%\%~1" "%output%\%~n1%cn%%~x1">Nul
GoTo :EOF