If your apps intergrate in with VB or VBA scripts or VBScript, it's possible last week's Patch Tuesday may wreak havoc with your applications:
https://tech.slashdot.org/story/19/08/17/0153225/windows-update-to-fix-criti...
In the past, I've shipped some apps with Office or Exchange functionality that used a a variety of techniques that included scripting, Automation and VBScript for Exchange configuration.
You might want to do some testing if you're in a similar situation/.
Happy Monday,