However, the option to enable both of these settings may not be immediately visible. Follow these steps to enable grouping by conversation and date:

Steps to Group Emails by Conversation and Date in Outlook:

1. Open Outlook and navigate to the Inbox or the folder where you want to apply the grouping.
2. Enable Conversation View:
   • Click on the View tab in the ribbon.
   • Select Show as Conversations (If prompted, choose whether to apply this setting to all mailboxes or just the current folder).
3. Group by Date:
   • Under the View tab, click Arrange By (or Sort in some versions).
   • Ensure that emails are sorted by Date.
   • If you don’t see the option, click View Settings > Group By and select Received (Date).
4. Ensure "Show in Groups" is Enabled:
   • Go to the View tab.
   • Click View Settings > Group By.
   • Check the box for Automatically group according to arrangement.
5. Expand or Collapse Conversations:
   • Click on any email thread to expand or collapse grouped messages.

Follow Below Screeshot:

1: Select Group ByDate first

2: Now Click on the highlighted bar columns anywhere, you will see these option and select to change it.

3: After Change you will see this dialog box to select folder.

You've to do it seperately for sent Iteams folder, follow the same above screenshot.

After these steps, Outlook will now display emails grouped by conversation while also maintaining the date-based organization. If you are using Outlook Web (OWA), a similar setting can be found under View settings in the top-right corner.