Microsoft Stream – a cloud-based enterprise video service – is available as a Plan 1 User SL ($3 per month) or Plan 2 ($5 per month). This page (http://bit.ly/2phNAqx) is useful for comparing the features of the two plans, but many Office 365 plans already include rights to Stream, the exact details of which are shown here: http://bit.ly/2ox1TXB. This page also explains how Stream storage works: each tenant receives 500 GB of storage and an additional 0.5 GB per licensed user, with the exception of Office 365 F1 users. Further Stream storage is available as an Add-on licence.