outlook, exchange

i am getting this pop up when I installed office 2016 . ( attached)

any reason why myself and other users are seeing
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pramod1Asked:
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David Johnson, CD, MVPOwnerCommented:
check the security details . you could simply trust this publisher.
AkhaterSolutions ArchitectCommented:
just disable the plugin you probably do not need it anyway
pramod1Author Commented:
But my question was why the error is coming
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AkhaterSolutions ArchitectCommented:
Could be a number of things

1. the windows version you are running is not updated & thus the certificate that signed this DLL is not installed in your trusted CA
2. there is a newer version of Outlook that you should upgrade to

in short it is most likely an update missing somewhere
pramod1Author Commented:
But when I trust this it never pops up again
pramod1Author Commented:
My last question what does that click trust all do
AkhaterSolutions ArchitectCommented:
it will trust the root and yes it shouldn't show up again
pramod1Author Commented:
Trustvroot certificate? Which u said was not installed?
AkhaterSolutions ArchitectCommented:
I didn't say anything I said it was the likely cause....

anyway if you don't want to click "trust all" you can start by fully updating your windows and Outlook first
pramod1Author Commented:
I wanted to know what u mean by trust the root that is all
AkhaterSolutions ArchitectCommented:
the certificate that is singing the code of this add-in will be added to the trusted certificates of your computer so that other code signed by the same Certificate will be auomatically trusted

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