Your Microsoft 365 mailbox has a limit on how much mail it can hold. For the majority of plans, your primary mailbox size will be 50GB and while this is usually more than enough for most, users who deal with a high volume of mail can quickly reach this limit. Once this limit is reached users can be faced with the choice of having to clean out their old mailbox to make space, which can be a stressful and time-consuming process. Microsoft 365 Email Online Archiving Archiving can be used to automatically remove old clutter from your mailbox without the stress of deleting older items, it also effectively increases a users mailbox size without having to purchase a more expensive licence for the mailbox. Depending on your licence, your archive can increase your effective mailbox size by 50GB,100GB, or even unlimited.