You can explore and restore data from backups in the Restore Portal. As an end user, you perform a self-service data restore. As a restore operator, you investigate and restore backed-up data for objects that you have permission to manage.
If your organization currently has subscriptions to Office 365 Enterprise E3 or E5, the default mailbox storage limit is supported 100GB. You can check it from the account information of outlook.
Unfortunately, there are many people noticed the default size is still showing 50GB, today, I am going to show you how to increase it to 100GB.