Certainly. In fact, if you simply uninstall Outlook 2003 and install Outlok
2007, your data should appear in Outlook 2007 automatically. That said,
it's still a good idea to back up your Outlook files first. http://www.howto-outlook.com/Howto/backupandrestore.htm
Asuming you are upgrading on the same PC there is no transfer required, 2007
should automatically connect with your origonal data file.
As with any PC operation your data files should in any case be backed up. -
its only neccessary to copy the data files NOT import/Export - also MS has a
free backup addin on the MS Outlook site
