Outlook (Word Editor)2003 will not autofill names

I installed 2003 outlook and word (outlook editor) on my brand new Win 8.1 netbook and when typing the "TO" and "CC" lines the names show up but when pressing enter they will not be accepted. I have to enter the first couple of letters of the names and then press the "check names" icon and go through the list even though the one I wanted was the one that showed up on the auto fill line...