As you may already know, Microsoft has started to deploy a new feature called Groups on Exchange Online – and which will be also available with Exchange 2016.
To simplify a little bit, the Groups feature is aimed to replace Site Mailbox and Distribution List by allowing end users to create a SharePoint site to share content and at the same time.
To know more about this Groups feature go to https://blogs.office.com/2014/09/25/delivering-first-chapter-groups-office-365/ and https://support.office.com/en-US/Article/Find-help-about-groups-in-Office-365-7a9b321f-b76a-4d53-b98b-a2b0b7946de1?ui=en-US&rs=en-US&ad=US
But this is not the object of this post. Indeed, while the Groups has been available there has been a lack for this feature in the mobile world. Lack which is now starting to be filled with the Windows Phone Groups app for Windows Phone 8.1 and Windows Phone 10
To install this app, go to https://www.microsoft.com/en-us/store/apps/groups/9nblggh1pbr5