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Microsoft recommends that you maintain a range of 2,500 to 5,000 items in a folder.
Additionally, you can create more top-level folders or create subfolders under Inbox, Sent Items, and Deleted Items.
You can create a Search Folder which aggregates all the emails of the Private folder and all its subfolders into a single view.
This applies to any other personal folders that are heavily used.You can do it as following: Step 1: Right click the folder that you will show its item number, and click the Properties in the right-clicking menu.Step 2: In (Folder) Properties dialog box, check the Show total number of items option. Then the number behind selected folder will be changed from the number of unread items to the total number of items at once.JAN 2017 UPDATE: Although Outlook 2016 for Mac is more robust and able to handle a larger quantity of messages than the tired old 2011 version, it's still not the best email client when it comes to large databases (over 10GB).We have seen a direct relationship between the size of an Outlook database and the Spinning Wheel of Death.