What are you using for antivirus? This was triggered in the past by antivirus add-ins, but other add-ins could be the cause. Disable all non-Microsoft add-ins and restart outlook. Does it go away? If yes, enable them one at a time to see which is at fault.
Hi Diane:
I use Microsoft Defender as my primary antivirus. I also run Malwarebytes Premium in real-time protection mode for secondary protection but I completely disabled Malwarebytes (Settings | General | Windows Startup | Launch Malwarebytes in the Background When Windows Starts | OFF) and restarted my computer but that didn't remove the "<0w>" from my Outlook 2019 search box.
I've never added an add-in to MS Outlook 2019 (or any of my other MS Office 2019 programs) myself . As far as I know all add-ins I have at File | Options | Add-ins came with my MS Office Home and Business 2019 installation. From my MS Outlook 2019:
Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.4529 * Firefox v127.0.2 * Microsoft Defender v4.18.24050.7-1.1.24050.5 * Malwarebytes Premium v5.1.5.116-1.0.1252 * Macrium Reflect Free v8.0.7783 * Microsoft Office Home and Business 2019 C2R Version 2406 / Build 17726.20126