How to Increase Mailbox Size in Exchange 2016/2019, Globally and Individual User

By default, Microsoft Exchange 2013 and 2016/2019 come with 2GB mailbox size for all users. But as an IT administrator, you will be needing to increase the mailbox size from 2GB to different size for a specific user or all users at a time. This guide shows you how to increase mailbox size in Exchange 2013 and 2016/2019 for an individual user or globally on the database level, so it will apply to all mailboxes in a specific database.

Exchange server 2013/2016/2019 mailbox size can be increased either by EAC (Exchange Administration Console) or Powershell. It’s quite easy to increase the mailbox size, but you would be searching for the option if you are already familiar with older versions of Exchange 2010 or 2007.  EAC works completely on the web browser and you can control, manage and modify settings by accessing through the internet browser.

Read Also: How to troubleshoot Exchange 2013 after failed update

Increase Mailbox Size in Exchange 2013/2016/2019 for Particular User

In most of the occasions, you would probably need to increase the mailbox size for an individual user, not all users in your organization. Follow these steps to complete this task.

1) Access the ECP of Exchange 2016/2019 (definitely you must know this process, typing /ecp after the mail server URL in a web browser). Though below screenshots taken from the 2013 version, still, it is applicable for 2016/2019 servers since not much change in the web interface.

2) Under ‘Recipients’, select the user mailbox you need to increase the size. Click on ‘Edit’ to open the properties.

open the mailbox to edit

3) Select ‘mailbox usage’ to increase the size. You need to click on ‘More Options’  to get the option to set mailbox limits as below. Usually, the mailbox size settings will inherit from database limit (which is shown in next step) settings. If you need to modify the quota settings, check the ‘Customize the quota settings…’ and set the size in GB. You can also set ‘Unlimited’ here. Unlike earlier Exchange 2007, the size increase will take effect immediately and the user can see the changes immediately on MS Outlook or Outlook Web Access.

increase user mailbox size in exchange 2013

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How to Set the Mailbox Size in Database Level

When you modify the mailbox size quota at the database level, it will apply to all mailboxes in the database based on the policies.

4) In the same ECP, click on the ‘Servers’ and ‘Databases’  tab. Then select the database you need to modify the quota settings globally, and click ‘Edit’ to open the particular database’s properties.

increase mailbox size exchange 2013

5) Click on ‘limits’ and set the size quota for a particular database. This size restriction will be applied to all mailboxes in the database (if you have not set the size limits separately as shown in step 3)

limits of database

To see whether the changes have been applied to mailboxes, you can open any recipient’s mailbox properties (as shown in step 2 & 3) and see the new modified quota limit. The change will take effect depending on the database size and number of mailboxes.

Hope this simple step by step guide is helpful to increase the mailbox size in Exchange 2013/2016/2019, including all major Service Packs and Cumulative Updates (CU). Do let us know if you find this useful or you know any other ways.

Dinesh is the founder of Sysprobs and written more than 400 articles. Enthusiast in Microsoft and cloud technologies with more than 15 years of IT experience.

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