Duplicate emails in Sent Mail folder when sending from Outlook with Gmail account

Symptom:
Duplicate emails in Sent Mail folder when sending from Outlook with Gmail account.
(Delivery just once, but store twice.)

Solution:
Go to File => Account Settings => Account Settings => (your gmail account) => Change… => More Settings… => Special => Sent Items and then check the option "Do not save copies of sent items"."

Settings of different Outlook versions:
https://www.msoutlook.info/question/prevent-duplicate-sent-items-gmail

Source:
superuser.com

SunVote error - System.IO.FileNotFoundException

SunVote 1.3.2.0-Beta

Error message:

System.IO.FileNotFoundException: Could not load file or assembly 'System.Windows.Forms.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. File name: 'System.Windows.Forms.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

System.Windows.Forms.DataVisualization

Solution:
Download and run the MSChart.exe at
https://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=14422

Source:
stackoverflow.com