Free forever? Or for 15 evaluation days?

Free forever? Or for 15 evaluation days?

HI,

just signed up for the "Free Forever" plan for 10 users. However when logged on the system says that i have 15 more days left to use testversion...
Which is it? As do not want to engage too much or place a lot of work building up base of leads if forever only lasts for 15 days...? 
Our company is yet new and small and will cope with 10 users still for a while.
Grateful for response!