Sue mosher [mv 2012-04-22 01:35:28
Short answer: You can’t unless you’re the Exchange administrator or you recode your project.
Long answer: The security dialogs that pop up when an application tries to access certain Outlook properties and methods are designed to inhibit the spread of viruses via Outlook; see http://www.slipstick.com/outlook/esecup.htm#autosec. If you are a standalone user, Outlook provides no way to suppress this behavior. However, you can use a free tool called Express ClickYes (http://www.express-soft.com/mailmate/clickyes.html) to click the security dialog buttons automatically. Beware that this means if a virus tries to send mail using Outlook or gain access to your address book, it will succeed.
If you’re the administrator in an Exchange Server environment, you can reduce the impact of the security prompts with administrative tools. See http://www.slipstick.com/outlook/esecup/admin.htm
— Use Extended MAPI (see http://www.slipstick.com/dev/mapi.htm) and C++ or Delphi; this is the most secure method and the only one that Microsoft recommends.
— Use Redemption (http://www.dimastr.com/redemption/), a third-party COM library that wraps around Extended MAPI but parallels the Outlook Object Model
— Use SendKeys to “click” the buttons on the security dialogs that your application may trigger. See http://www.slipstick.com/outlook/esecup.htm#autosec for a link to sample code.
— Program the free Express ClickYes (http://www.express-soft.com/mailmate/clickyes.html) tool to start suspended and turn it on only when your program needs to have the buttons clicked automatically.
Sue Mosher, Outlook MVP
Outlook and Exchange solutions at http://www.slipstick.com
Microsoft Outlook Programming: Jumpstart
for Administrators, Power Users, and Developers