What is the difference btwn microsoft office standard and microsoft office professional?

Professional includes the database program, Access.

You can compare versions of Office 2007 here:

What is the difference btwn microsoft office standard and microsoft office professional?anti virus

features ... standard is missing certain apps like frontpage i think .. and others ... the full versions have alot more things ...

What is the difference btwn microsoft office standard and microsoft office professional?auto protect

office standard will include word, excel, powerpoint. Professional will include these plus access as well...