How to Increase Mailbox Size in Exchange 2013/2016, Globally and Individually User

By default Microsoft Exchange 2013 and 2016 comes with 2 GB 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 specific user or all users at a time. This guide shows you how to increase mailbox size in Exchange 2013 and 2016 for individual user or globally in database level, so it will apply to all mailboxes in specific database.

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

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Increase Mailbox Size in Exchange 2013/2016 for Particular User

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

1) Access the ECP of Exchange 2013 (definitely you must know this step, typing /ecp after the mail server URL in web browser). Though below screenshots had been taken on 2013 version, still it is applicable for 2016 server as no much change in new 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.increase user mailbox size in exchange 2013Usually 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 affect immediately and the user can see the changes immediately on MS outlook or Outlook Web Access.

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How to Set the Mailbox Size in Database Level

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

4) On the same ECP, click on the ‘Servers’ and ‘Databases’  tab. Then select the database you need to modify the quota settings as global, 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 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 databaseTo 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 quota limit changes. The changes will be applied soon based on the database size and number of mailboxes.

Hope this simple step by step guide would be helpful to increase the mailbox size in Exchange 2013/2016 including all major Service Packs and Cumulative Updates (CU).

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