Office 2003 Basic is not the same as Office 2003 Standard. Basic includes
Word, Excel, and Outlook. Standard includes Word, Excel, Outlook, and
Powerpoint.
Not sure what you mean by "upgradable". Office 2003 Standard is available
in "full" and "upgrade" versions, while Office 2003 Basic is only available
as a "full" version. An upgrade version costs less than a full version, but
you must own a qualifying product (such as Office 97, Office 2000, or Office
XP) to install the upgrade version. A full version does not require that you
own a qualifying product. Office 2003 is the current version of Office.
When the next version of Office becomes available, both Office 2003 Basic and
Office 2003 Standard will probably be qualifying products for upgrade to the
next version, but nobody knows for sure at this point. You can always add a
"full" version of an individual application to whatever Office 2003 edition
you choose. For example, you can purchase a full version of Access 2003 and
install it with either Office 2003 Basic or Office 2003 Standard, or you can
purchase a full version of Powerpoint 2003 and install it with Office 2003
Basic.
Hope I haven't further confused you.