yes, outlook 2007 has the ability to see more than 2gb pst file size.
yours probably was corrupt and needed to be fixed.
you can go find the file and fix it via these instructions:
http://office.microsoft.com/en-us/outlook-help/repair-an-ost-or-pst-file-in-outlook-HA001056300.aspxonce fixed you can either attach it as 2nd pst or import all it's information into your current pst via the Import feature found under the file menu.