I did a quick search and only found issues related to that KB for UCCX, not CUC, if this is really because of a KB, as 11.5 is very new, you probably want to open a TAC so they can investigate if this is really because of a KB, and then see what possible fixes are available.
I contact TAC and they wanted me to uninstall the Windows 10 cumulative update released this month. He then wanted me to contact Microsoft and find out what they screwed up in their update. He just didn't quite grasp the concept that they are suppose to directly work with their business partners to resolve compatibility errors. He also didn't understand why I was asking him to replicate my error in their test lab.
By posting on the forums I had hoped that someone else could confirm my issue.
Windows 10 Pro 64
Outlook 2010 32bit
KB3163018 Applied to client machine
Note: As a test I downgraded my Viewmail client and I still had the same failed connection issues.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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