Outlook not connecting with Exchange 2010 in a network environment on an iMAC.

Outlook 2016 is not connecting to Exchange 2010 in a network environment - on an iMAC.
The icon shows up as orange instead of green.
And I keep getting issues regarding certificates.

I want to delete any any keychain passwords for the Microsoft Outlook app, and perhaps any certificates used by Outlook as well.
How can this be done?
100questionsAsked:
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strungCommented:
Open the Keychain Access App found in /Applications/Utilities.

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100questionsAuthor Commented:
I tried however there is nothing that indicates I can delete it.
In another MAC I can see how right clicking on the key will allow you to delete it.
Could deleting the key be somehow blocked?
strungCommented:
What happens when you right-click on it? Can you post a screen shot? Do you have admin privileges?
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100questionsAuthor Commented:
I will double check and advise back.
strungCommented:
If the keychain is locked, Command-L should unlock it, or pull down the File menu to Unlock keychain.
100questionsAuthor Commented:
Even when keychain is unlocked, right clicking on any key chain line does nothing.
In another MAC, right clicking on key chain will allow me to delete it, but not on this iMAC.
Any suggestions?
strungCommented:
Pull down the keychain menu and choose keychain first aid.
100questionsAuthor Commented:
I was able to delete the keyhchain by using the menu on the top.
100questionsAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for 100questions's comment #a41151227

for the following reason:

It works
100questionsAuthor Commented:
I used the Menu on the top and then I was able to delete individual keychains.
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