- I recommending backing up the Autocomplete from both Accounts via Backing up and restoring the AutoComplete cache of Outlook 2010, 2013, 2016, 2019 and Office 365 – MSOutlook.info
- Login to account you would like to copy the autocomplete from in Outlook , it will create a C:\Users\%username%\AppData\Local\Microsoft\Outlook\RoamCache\Stream_Autocomplete_0_XXXXXXXXXX1.dat file
- You can use nk2 editor to read this if you want to confirm http://www.nirsoft.net/utils/outlook_nk2_edit.html
- Login to the account you would like to copy the to , it will create a C:\Users\%username%\AppData\Local\Microsoft\Outlook\RoamCache\Stream_Autocomplete_0_XXXXXXXXXX2.dat file
- Cloud outlook and rename Stream_Autocomplete_0_XXXXXXXXXX2.dat to Stream_Autocomplete_0_XXXXXXXXXX2.datold and rename Stream_Autocomplete_0_XXXXXXXXXX1.dat to Stream_Autocomplete_0_XXXXXXXXXX2.dat.
- Reopen outlook
- Add a new contact that’s not in your autocomplete e.g. [email protected] and send an email
- Close Outlook and reopen it
- It should merge your old Autocomplete with your existing one
How to Merge an Outlook\Exchange Autocomplete with Another
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