You can also download the demo version of this tool which is absolutely free of cost. This utility is equipped with all the features that can easily take a backup of your entire Office 365 data. So, for this purpose, I will recommend using SysInfoTools Office 365 Backup Software. It is always better to take the regular backup of your data, even if you delete the messages you can easily get them back from the backup.
So by now you must have got the idea of how to find old emails in Office 365. Even if you delete this folder after viewing the email messages, only the folder will be removed not the messages. This is one of the easiest methods to find older emails in MS Outlook. The folder name will be based on the time you select while creating a search folder. Now, you will see that a new folder has been created and added to the Navigation Pane.Additionally, if there is more than one account in your Outlook, then you can select that specific email account and click Ok. MS Outlook group messages older than one-week by default, you can select any time span from which you want to group messages. After that, navigate to Organizing Mail in the opened tab and select Old Mail.First of all, open Outlook 2016/2013/2010 and click the Folder tab, and then select New Search Folder.
Just follow the below steps to create a search folder and group all messages that are older.