How to retrieve an history of Exchange applied updates?

Hi everyone.

I need to examine the history of applied updates on Microsoft Exchange Server 2013.

I couldn't find out how to achieve this.
Of course I can check the last applied update/build level, I can retrieve OS updates history by several means, but that's not what I need.

Thanks for helping (just to retrieve updates history, pls don't advice about how to drop the idea).

Regards, Luc