Reduce Outlook Mailbox size by Manual Method

Updated on September 04, 2023 by Savita Sharma

We all know that Microsoft Outlook is one of the most used email clients, as it offers a lot of advantages to its users. But its excessive use leads to oversized mailbox. Whenever the mailbox size of Outlook crosses the recommended size, users get a notification. A notification from Outlook that says your mailbox is full of messages and you need to reduce your mailbox size for further use. For some reason, there might be a lot of unwanted emails and attachments in your mailbox that you still need to clear out for the time being; that's why your mailbox now has no space.

But before starting the mailbox-reducing process, you must take a backup of the Outlook PST files. You can easily do it by using the Regain Outlook PST Recovery software.

What Issues You May Face Due to Excessive Mailbox Size in Outlook?

Excessive mailbox size in Outlook can lead to several problems, making using email a frustrating experience. Here are some common issues:

Slow Performance: When your mailbox gets too big, Outlook can become sluggish and take a long time to open, send, or receive emails. This is because it has to load and manage a lot of data.

Freezing or Crashing: Large mailboxes can cause Outlook to freeze or crash, especially when performing tasks like searching for emails or opening attachments.

Difficulty Searching: It becomes harder to find specific emails when your mailbox is overflowing. Outlook's search feature may need to be fixed, or it might take a long time to show results.

Sync Problems: If you use Outlook on multiple devices, like a computer and a smartphone, a large mailbox can lead to synchronization problems. Emails may only appear consistently across some of your devices.

Email Send/Receive Failures: Large mailboxes can trigger errors when sending or receiving emails. You might get error messages that prevent you from sending or receiving essential messages.

Storage Issues: Your email server may have a storage limit, and an oversized mailbox can lead to you needing more storage space. This can prevent you from receiving new emails.

Backup and Recovery Problems: Backing up and recovering your emails becomes more challenging with a large mailbox. Creating backups can take a long time, and restoring emails may take much work.

Increased Vulnerability: A big mailbox can be a tempting target for hackers and cyberattacks. Keeping unnecessary emails can expose you to security risks.

To avoid these problems, it's a good practice to regularly clean up your mailbox by deleting unnecessary emails and attachments, archiving old emails, and organizing your messages into folders. This will help keep your Outlook experience smooth and efficient.

How to Reduce Outlook Mailbox Size Easily?

As you have read above, it's common to have the above errors if your mailbox is full. Most of the time, you will receive send-and-receive mistakes, such as being unable to receive emails because there is insufficient space in your Outlook mailbox to add more emails.

Deleting some emails is the first aid to curing this issue. But the reasons for this situation can be different depending on many materials. This post will teach you about multiple methods to deal with this total mailbox error. Keep reading and applying.

Solution 1: Remove the Large Emails with Attachments

There is no other easy way to delete extra-large emails with more significant attachments. But deleting emails manually, one by one, is too disgusting. However, you can perform the deleting process with an in-built facility in Outlook. Read as follows:

You can delete the folder to get some more space. However, you can also create a specific folder. Whenever you get the error of low area in your Outlook mailbox, you can quickly delete the folder and get the additional fixes.