The lone free and active GPG project for Windows with outlook plugin that I know.
As I do not find anything but the uninstaller with details:
File name and path: C:\Program Files (x86)\Gpg4win\gpg4win-uninstall.exe Product Name: Gpg4win (3.1.15) Internal Name: Original Filename: File Description: Gpg4win: The GNU Privacy Guard and Tools for Windows Company: Intevation GmbH Legal Copyright: Copyright (C) 2020 Intevation GmbH Legal Trademarks: Comments: Gpg4win is Free Software; you can redistribute it and/or modify it under the terms of the GNU General Public License. You should have received a copy of the GNU General Public License along with this software; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA File Version String: 22.214.171.124122 File Version: 126.96.36.199122 Product Version String: Product Version: 188.8.131.52122
OK, I mark the topic as Added and move it to the category Added App Requests.
I've added a lookup, we will start to collect information on this and hopefully add proper detection before the end of the week.