I have installed Windows Defender on a few of the corporate laptops and noticed that they were not getting definition updates.  I tried reinstalling the product but was unable to get it to update.  Google turned up some leads but none of them worked for me.  On a whim I went to check out WSUS server to see if the updates were available there.  In the Sync Options area, under Products I saw what I wanted to see.  Windows Defender updates are pushed through MS Update and since we use WSUS instead of MS Update the laptops were not getting updated.   I few clicks and a sync later our Windows Defender installs are now getting up to date definitions.

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