Comparing to deleting the specified registry key to clear all recent search history in Outlook, Kutools for Outlook releases the Clear Search History feature to help you quickly remove all search history with several clicks only! Click for 60-day free trial without limitation!

To search all emails with attachments in Outlook, you can easily do as follows:

Please (1) press Ctrl + E keys together to activate the Search Tools, (2) click Search > Has Attachments, and then (3) specify the search scope in the Scope group. See screenshot:

And now the search criteria hasattachments:yes is added into the Instant Search box automatically, and all emails with attachments are found out from the specified search scope. See screenshot:

Search with multiple keywords in Outlook

Search global address list by last name in Outlook

Search emails by recipients’ names in Outlook

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