Question about Outlook Express

We recommend that all our students purchase and install Office 365 University on-line.  One of the first steps in doing so is to create a Microsoft account to verify eligibility and install the software.  However, if this is done on-campus, students receive the Sign Up Error 450:  You've reached the daily limit . . . .

 

We have a public IP address, so am guessing that since Microsoft sees all the requests coming from a single IP, it shuts down after a couple of accounts are created.  Is there a way to increase our limit, or white list our IP so students can get their software?  This is becoming quite an issue for us with many irate students and now their parents.

 

Mike