Can I disable Microsoft Windows Search protocol host?

To stop this prompt, open Control Panel > Mail (Microsoft Outlook 2016) (32-bit), select the older mail profile that matches the account listed in the Search Protocol Host credential dialog window, and click Remove, then click OK.

What does Microsoft Windows Search protocol host do?

SearchProtocolHost.exe is part of the Windows Indexing Service, an application that indexes files on the local drive making them easier to search. This is a crucial part of the Windows operating system and should not be disabled or removed.