I recently installed Kleopatra and ended up running into the error kbuildsycoca4.exe and libkdeui.dll missing.

This error is easy to fix, all you have to do is to add the path to GnuPG to your system path.

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Modifying System Environment Variables

1. Step Open the search and enter “system var”

Edit The System Environment Variables.png

Alternatively, hit Windows + R and enter systempropertiesadvanced then hit Enter. On the advanced tab, at the bottom click the button Environment Variables

2. Step Scroll down and locate Path. Click Edit

Editing System Path Windows8.png

3. Step Now append the following path with a leading semicolon. Repeat the same for the user variables just to be sure.

C:\Program Files (x86)\GNU\GnuPG

Adding System Path Variable.png

4. Step Confirm with Ok, twice.

This should take care of it. You can now run Outlook 2013 just fine.