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:

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Kutools for Outlook - Brings 100 Advanced Features to Outlook, and Make Work Much Easier!

• Auto CC/BCC by rules when sending email; Auto Forward Multiple Emails by custom; Auto Reply without exchange server, and more automatic features...
• BCC Warning - show message when you try to reply all if your mail address is in the BCC list; Remind When Missing Attachments, and more remind features...
• Reply (All) With All Attachments in the mail conversation; Reply Many Emails in seconds; Auto Add Greeting when reply; Add Date into subject...
• Attachment Tools: Manage All Attachments in All Mails, Auto Detach, Compress All, Rename All, Save All... Quick Report, Count Selected Mails...
• Powerful Junk Emails by custom; Remove Duplicate Mails and Contacts... Enable you to do smarter, faster and better in Outlook.