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Mailbox size increase issue

We are using Office 365 and wanted to increase the size of a shared mailbox. There use to be more options link on the page which seems to be missing.


Ans: This can be done using the following command:

Mailbox -ProhibitSendQuota 9.75GB -ProhibitSendReceiveQuota 10GB -IssueWarningQuota 9.50GB

Office 365 Plans
Office 365Kiosk Small business and small Business Premium MidsizeBusiness EnterpriseE1,Education








Primary mailbox size 2GB 50GB 50GB 50GB
Archive mailbox size N/A 50GB* 50GB* unlimited
Shared mailbox size N/A 10GB 10GB 10GB
Resource mailbox size 10GB 10GB 10GB 10GB

*Microsoft may change the size of mailbox as per their policy

Connect to Office 365 using Powershell

  1. You need to set up your computer to be able to use Powershell. This only needs to be done the first time and involves downloading some tools from the Microsoft website.

Here is a link to the tools you will need to install:


  1. Start the Powershell command line

Now that you have the tools installed, you can go ahead and open Powershell. The easiest way to do this is to press the start button and simply type powershell

You will now see a Powershell window

Now that you have a Powershell Window open, you can connect to Microsoft Office 365.

  1. You need to create a connection to Office 365. You can do this by typing (or copying/pasting) the following into Powershell.

$session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri “https://ps.outlook.com/powershell/” -Credential $cred -Authentication Basic -AllowRedirectionOnce

this is in the Powershell window, press Enter to execute the command.

  1. Type in the username and password for an Administrator account in your Office 365 and click OK. You are now authenticated into Office 365.
  2. The last step is to connect up to Office 365 by using the following Powershell command:

Import-PSSession $session

Congratulations! You’re connected!


After using this PSsession command you wont have trouble connecting to Powershell repeatedly. To test the connection try below command:


You should now see a list of all the users in your Office 365 account that have mailboxes!


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