What is the most important thing people are concerned about when they change or move email programs? Their email? No. Their address book? No. Their Calendars? No. The answer is their Autocomplete feature. Autocomplete in Outlook 2010 is the .nk2 file equivalent of Outlook 2007 and older. It stores all email addresses that you have sent to and, to be honest, is quite a handy file to have.
So here is how to do it:
1 – Browse to C:\Users\%username%\AppData\Local\Microsoft\Outlook\Roamcache\Stream_Autocomplete*.dat
2 – Copy it to C:\Users\[username]\Appdata\Local\Microsoft\Outlook\Roamcache (you may not need to do this as it may be there already)
3 – There will be a new Stream_Autocomplete file in there in use by the new account (if there isn’t – open Outlook and start typing in the “To” field to create that file. Then close Outlook again).
4 – Highlight the new file, hit F2 and copy the filename to the clipboard. Then delete that file. Highlight your old file, hit F2 and paste in the new filename.
5 – Start Outlook.