How can we increase ms exchange online mailbox storage?

Copper Contributor

Hi folks,


I wanted to ask what the easiest way to upgrade the storage size of our mailbox is. We have a Business Standard plan that comes with the Exchange Online (plan 1), which includes 50gb of mail storage.

As the subject says, how do we increase the storage size for our mailbox in the easiest way possible?

Any tips and suggestions are appreciated. Thanks!

4 Replies
The admin can upgrade the license in the admin portal. Exchange online plan 2 has a 100 GB mailbox. That is the largest mailbox available. If you need more, you need a plan that includes online archiving or will need to archive mail or move old mail to another mailbox.

@Diane Poremsky 

Thanks for the response.


We already have Business Standard which includes Exchange Online (Plan 1). Do we need to opt for another subscription of the Exchange Online (Plan 2)? Or is there a way for us to upgrade the already existing Business Standard subscription, but with Exchange Online (Plan 2)?

Oh... I thought you just had the plan 1. You need to upgrade to the E3 then - that is the lowest level office plan that includes Exchange Plan2.

Hi @RonKTB,


you can acquire a new license, choosing 03 options:


a) Exchange Online Plan2 = just edit the user who needs upgrade from 50GB to 100GB;

b) E3 = that user will explore not only 100GB for mailbox but also another resources/benefits (

c) M365 Business Premium = came with 50GB for mailbox + Online Archiving (


You should confirm what is the best option 'cost-benefits' for that user. Keep in mind that you can change license anytime - but first check the commitment of that license (monthly payment or annual payment).