Preferred PST Mode (Unicode/ANSI)
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
HKCU
software\policies\microsoft\office\16.0\outlook Options
newpstformat enum - Prefer Unicode PST
->
0 - Prefer ANSI PST
->
1 - Enforce Unicode PST
->
2 - Enforce ANSI PST
->
3
Description
Specifies whether new PST files created by the user are to be in Unicode or ANSI format, and whether the user is allowed to choose that format.