I am trying to renew license for Backup Exec 15. End date of license until 2017, but end date displayed in Backup Exec portal is 2016, match with the old license that I have.
So what's wrong?
These are the old licences which you can remove. There is another set of licences below these with end dates 2017
What matter with operartion of system if I remove the old license key, sir?
Maintenance licences do not matter. Whether you install them or not, BE will still function if the product licences are installed. Installating maintenance licence will only get you a warning when the maintenance period is ending.