
I do not want to try emptying the "Empty Auto-Complete List" for obvious reasons.
However, when you have a 64-bit edition of Windows and you know that all your add-ins and other applications that rely on Office support the 64-bit edition of Office 2016, you can safely install the 64-bit edition.
When it comes to Outlook, there is no direct benefit of having the 64-bit edition instead of the 32-bit edition.
Just an update, I used NK2Edit to view the stream_autocomplete*file and noticed there are more than 1000 entries.
In Outlook 2013, the [HKEY_CURRENT_USER\Software\Microsoft\Office.0\Outlook\Auto Name Check] which is in 2010 doesn't exsist in 2013.
Here's the rules for finding the location of your NK2 file: The nk2 file is located in C:\Users\[User Profile]\App Data\Local\Microsoft\Outlook\Roam Cache The name of the NK2 file is in the following format: Stream_Autocomplete_X_The X is the file index (usually 0) and AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA is a random 16-byte key in hexadecimal format.
The nk2 file is located in C:\Documents and Settings\[User Profile]\Local Settings\Application Data\Microsoft\Outlook\Roam Cache The name of the NK2 file is in the following format: Stream_Autocomplete_X_The X is the file index (usually 0) and AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA is a random 16-byte key in hexadecimal format.
How states that the reduction is gained because “”.
These reports certainly match with my experience, so I was even more impressed at Microsoft’s achievement.
For more information see: Should I install the 32-bit or 64-bit version of Office/Outlook?
Note: Even when you are using the 32-bit edition of Office 2016, some add-ins might not be compatible yet with Office 2016.