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Delete System Keychain - Mac OS X
How to delete your system keychain on a Mac.
Step 1:Log in to your Mac.
Step 2:Select Finder.Step 3:Hold down the Option key and click Go. Library will be on the list. (Image thanks to MacWorld.)

Step 4:Click the Library folder. Open the Keychains folder. Click and drag System.keychain to the trash. Delete any other folders or files in the Keychains folder as well. 

Drag Keychain to Trash
Step 5:Restart your Mac. Log in with your e-mail password. Now you should be able to use this password to install programs. When you start Outlook, you will be prompted for your e-mail password.

In some cases, this may not initially work. You will receive pop-up messages asking for you to enter your login password, but neither your new password or your old one will work. In this case, you will have to reset the default keychain.
Step 6:Open the Keychain Access application, found in the Utilities folder. Click Keychain Access on the top bar.

Step 7:Select Preferences.
Step 8:Click Reset My Default Keychain.

Step 9:Repeat Step 4. Log out and in again. You should no longer receive these pop-up messages.

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