Note: Replace profile name with the name of your mail profile (by default it is called Outlook). HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\ profile name\0a0d020000000000c000000000000046 Outlook 2016, Outlook 2019 and Office 365.
MRU lists that are kept in the mail profile are stored in the following Registry key: If you are not comfortable editing the Registry yourself you can use OutlookTools instead. To clear either MRU list, you can simply delete the corresponding registry key when Outlook is closed.
Some are tied to the general Outlook configuration of the logged in user and others are tied to the specific mail profile Outlook has been started with. Outlook holds two different kind of MRU lists. In some cases you might want to clear this MRU list.
For certain actions, Outlook holds a list of most recently used items (MRU lists) so you have quicker access to them.
