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Empty Deleted Items Folder - Manually
As you might have observed, Outlook doesn’t directly delete the items that you have chosen to be deleted. It, however, moves those items from the active folders to a Deleted Items folder. This is done to help you recover any email or meeting that was deleted by mistake. But the size of this folder can grow immensely because this folder is not cleaned up by the users manually. Hence, it needs to be emptied to retrieve some space quickly.

You need to click on the File button on the top left of your Outlook and select Info. Then click on Tools.

It will open a small list. Choose ‘Empty Deleted Items Folder’ from the list.
A new window will pop up, and you need to click on ‘Empty Folder’ and then press OK or hit Enter.


Mailbox Cleanup
If the above methods have not fixed the issue for you, there is a high probability that most of the space is consumed by your active folders and needs to be cleaned up. Manual sorting and cleaning can take hours to free up space like this mainly because there is a limit to the size of email messages, which is mostly 25MB. Deleting a few emails can only temporarily fix the issue for you. The issue will occur again in a few days. So, you need to clean up some considerable space and further ensure that the free space is maintained. Let us first discuss the cleanup part.

From the Outlook menu bar, go to File > Info.
On the right-hand side, you would see a Tools button with a drop-down sign. Click on it and select ‘Mailbox Cleanup’ from the list.
It will open a new window. Select the ‘Find items larger than’ option and select the size you find appropriate. The default is set to 250 KB. Then click on the Find button.It will scan your Outlook items and list down all the mails and other objects which are greater than 250 KB. You can then delete those items and free up considerable space without manually scrolling through your emails.


Hope you find this helpful.