A:AnswerIf you are asking about the ability to add a 3rd party add-on then the answer is yes. If you mean other Software on your Operating System then the answer is also yes.
A:AnswerThe annual renewal cost is the standard price of whichever version of Office 365 you choose. If you find it on sale you can always purchase it and add it to your account to extend the subscription. You can learn how to add time to your subscription here: https://aka.ms/AA5opd6
A:AnswerYour Office 365 Business Premium subscription allows up to 300 users. One license covers fully-installed Office apps on 5 phones, 5 tablets, and 5 PCs or Macs per user.