Exchange 2016 - Issues with ECP/OWA after installing updates/KB

For several reasons after installation updates/KB (for example KB4536987) you may faced with some backfires. I collected 3 type of issues and their fixes.

Issue #1 - Lack os styles on ECP page

After authentication on ECP page you may see only text and hyperlinks without any images and styles.

How to fix

Run the script "C:\Program Files\Microsoft\Exchange Server\V15\Bin\UpdateCas.ps1" or do following manual steps:

• Go to "C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\ecp" folder and find the folder with latest version number of your server (e.g. "15.1.1913.7") and it will be empty.
• Open folder with previous version number (e.g. "15.1.1913.5") and copy all data to the new folder (e.g. "15.1.1913.7").
• Restart IIS. Reload the ECP page.