Using Classic Outlook on Windows for personal email, calendar, and contact management
Hello S-Soft,
Good day! Thanks for posting in Microsoft Community. We are happy to help you.
Based on your description I understand you want to know more information about IPM.Note.Secure : Encrypted notes to other people and IPM.Note.Secure.Sign : Digitally signed notes to other people.
According to my knowledge sticky notes cannot be encrypted, however for detailed explanation and more information on IPM.Note.Secure and IPM.Note.Secure.Sign reach out to office-vba-dev - Microsoft Q&A. Experts there would conduct in-depth research on the problem you encountered and provide you with more professional assistance. This topic is out of our support scope and this team can address all your queries as this is there are or expertise.
Thank you for your kind understanding and cooperation.
Sincerely,
Simbarashe | Microsoft Community Moderator