And that would be for WHICH version of Office as the trial? All
editions of version 2003 of Office included Outlook. The Home/Student
(and maybe the basic) edition do not include Outlook. We don't know
what were the trial version and what versions you went back to because
you didn't mention them.
While the other components of Office will tolerate multiple concurrent
installs of different versions of themselves (Word, Excel, Powerpoint),
there can only be ONE install of Outlook on a host at a time. When you
installed the unidentified trial version of Office (which presumably
included Outlook), it *replaced* your current Outlook installation.
When you uninstalled the trial version, the original versions of every
Office component was still left on your computer EXCEPT Outlook since
all you had before was the trial version.
http://support.microsoft.com/kb/930559
Since the trial's install would not automatically install the trial
version of Outlook 2007 over your old version of Outlook, you had to
enforce the choice of replacing the trial version for your old version.
http://support.microsoft.com/kb/295167
Um, so if you don't have the installation media for the prior version,
just how did it get somehow installed on your computer? If it was
pre-installed by the computer maker, and if they didn't just toss trial
versions of programs into their image to bloat their product list, the
installation of Office would reside in however that computer maker
provides for recovery of your computer and its OS. That might be a
regular installation where you get what to install. It might be only a
factory-delivered image so you have to wipe the OS partition and restore
that complete image to get back all the software. Your computer's
manual will tell you how to do a restore or recover software that was
included with the computer.
And WHY don't you have the product key to reactivate your original
versions of Office if it is a legitimate copy? If they were
pre-installed (and NOT trial versions themselves) then the system
builder should have put the product key sticker on the computer case.
Otherwise, check the product packaging for either a sticker yet-to-be-
applied or a label with the product key. If you threw away the product
key, you threw away the license for Office (and you'll have to contact
Microsoft to see if they'll ship you another install CD at some shipping
cost, or contact the system builder or seller if it was an OEM version).
http://support.microsoft.com/contactus/cu_inventory?ws=mscom
Replacements, refunds, and rebates
If an OEM version, contact whomever made your computer. You didn't get
the OS and any included software from Microsoft. Those came from the
OEM (Original Equipment Manufacturer).