How to Fix Outlook Search Error Something went wrong and your search could not be completed

We had an issue where searching in Outlook 2010-2016 was getting an error / "Something went wrong and your search could not be completed. It appears there is a problem with your network connection. /". All network tests through Outlook passed, all updates installed, we recreated Outlook profiles, disabled Cached Exchange Mode and repaired/reinstalled Office, still nothing until we tried changing reg ci below.

Regedit path if not this one try the one below
HKEY_CURRENT_USER//Software//Policies//Microsoft//Office//16.0//Outlook//Search
HKEY_CURRENT_USER//software//Microsoft//office//16.0//outlook//search

Value name: DisableServerAssistedSearch
Value type: REG_DWORD
Value: 1

Other things to try if the above doesn't work.

Stop the Windows Search service and delete all files from the directories below, then restart the computer and test the search again.
C://ProgramData//Microsoft//Search//Data//Applications//Windows
C://ProgramData//Microsoft//Search//Data//Temp

This may be caused by a Windows update – KB4022722 Windows 7 or KB4021558 and KB4022722 for Windows 10

The Outlook add-in interferes with the search function. It might be a disabled third-party plugin and try searching again after restarting Outlook.

Outlook indexing is broken, so try dropping the index and asking it to reindex the emails.

The corrupt Office installation tries to repair the installation or reinstall it.

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