Group and Ungroup Conversation Threads in Windows Mail
Arrange messages in conversations in Windows Mail or turn the feature off, if desired.
Group Conversation Threads in Outlook
In Microsoft Outlook, the settings for conversations are on the View tab.
Change Conversation Options
Outlook allows you to change several other conversation options, as well. These are available from the View tab.
Show Messages from Other Folders displays messages in the conversation that you have moved to other folders, including messages in your Sent Items folder.Show Senders Above the Subject shows the senders’ names at the top of the conversation instead of the conversation subject.Always Expand Selected Conversation expands the conversation whenever you open it. This option only applies to the currently selected conversation. Use Classic Indented View Classic shows messages in the conversation indented based on their position within the conversation.