ORIGINAL ARTICLE: https://community.spiceworks.com/topic/ ... nother-pst
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The autocomplete list in Outlook 2010 is stored in the C:\Users\"username"\AppData\Local\Microsoft\Outlook\RoamCache folder in the Stream_Autocomplete_0_"numbers/Guid".dat file. When you get the new profile created in Outlook, open a new message and send it to someone then close Outlook and reopen it and close it. This will create a new Stream_Autocomplete_0_"numbers/Guid".dat file. You can tell by the size because it will be very small like 8 kb or less. Copy the Stream_Autocomplete_0_.dat file from the old PC to the new one and rename it to have the same name as the new empty file and Outlook will use and they have their autocomplete list back.
You can also still edit the list with NK2Edit from nirsoft.net and you can convert entries in the list that are EX "Exchange" entries to SMTP entries.
I know because we are currently going through an Exchange to Google Apps conversion and we have to do this to keep the users' autocomplete list.