For those readers who administer a Google G Suite environment, take note of an announcement that Google made this week. On February 28, 2018 the classic Google Calendar interop tool will be shuttered, meaning that you will need to be using the new tool which was announced back in July.
For those who aren’t familiar with this tool, it allows for the seamless coexistence of a Microsoft Exchange or Office 365 environment within a G Suite account in that same environment. That means users can search across not only Google Calendar but Microsoft-based calendars for information, meeting times and the like.
In July, Google released a far more robust version of this interop tool, bringing several new features and overall stability to the solution. That is the version that Google wants you using and, come February next year, you will have to use it going forward.