Nicknames for AutoComplete (.dat)

Brand new Dell 2/1. Existing Office 365 account installed yesterday. Set up Outlook with my email, which is Gmail set up in IMAP. I sent one email, so that the AutoComplete file should have been created. I copied the .dat file for AutoComplete from the old PC from this location: C:\Documents and Settings\ \Application Data\Microsoft\Outlook\RoamCache.

Here's the problem - on the new Dell, that location does not exist! I have searched long and hard to try and find if an alternative exists, but to no avail. How can I import or otherwise install the AutoComplete entries from my old PC onto the new one? Many of the email addresses I use frequently only exist in this file. I don't have contacts in Outlook for them. Thanks.