Increase number of mailboxes (subscriptions) for NetVirtue Office365 services
You can increase the number of subscriptions (mailboxes) from within the nvArea. Once you login, click on Hosting Services, Manage Hosting. 
Click on your Office365 account in the center of the screen. 
At the top, there is a Subscriptions Tab that you can hit, which will then provide you with the following options to increase your subscriptions. 
Click on your Office365 account in the center of the screen. At the top, there is a Subscriptions Tab that you can hit, which will then provide you with the following options to increase your subscriptions.