For Skype for Business Online organizations, you can use the Remote PowerShell in Office 365 to enable your Skype for Business users to use the Skype for Business client or the Skype for Business (Lync) client user interface. The default setting is for users to use the Skype for Business client user interface.
Yes you do - all of it, but under most circumstances, not until after you graduate college (or leave school for other reasons). Under normal circumstances when you graduate or drop below a certain # of units of attendance, you will be expected to begin paying back your student loan 6 months later. For subsidized student loans, this is when the interest will start accruing as well.
When do I have to start payments on my student loan? Stafford loan borrowers begin repayment after a 6-month grace period. Students enter their grace period after dropping below at least half-time enrollment status from the school they are attending. On the subsidized Stafford loans the government pays all interest during the grace period.