Can I use my current mobile email apps? What mobile apps are supported?

Yes, you can use your current mobile email apps. However, we recommend users to get the Office mobile apps to use features provided by Office365. Learn more about Office mobile apps at https://products.office.com/en-my/mobile/office  or submit an online helpdesk request at https://apiit.atlassian.net/servicedesk/customer/portals for the upgrade.