Let's do the Math
Let us assume, you are a startup or a small to medium enterprise (SME) with a couple of dozens to a few hundred employees that want use business collaboration and productivity applications.
You will most likely go with a subscription business model where the applications are hosted by the vendors as software-as-a-service (SAAS). An average payment between $5 - $15 will hence be paid per user every month for each application such as Email, ERP, CRM, web/video meeting, etc.
For a small company consisting of 50 people, the annual costs would be:
# Email @ $5 per user per month = $3,000
# CRM @ $12 per user per month = $7,200
# ERP @ $10 per user per month = $6,000
# Video @ 5 per user per month = $3,000