We've been able to successfully retrieve all the emails sent and received by each account that were still stored on the old email server, and they are now grouped into folders by account. We've done a test delivery of those emails to OPLIN staff, with good results, and are in the process now of preparing login credentials that we can send to all the other accounts.
A few things to know (and these will be repeated when we send login credentials):
We have reports that several libraries have successfully registered for Office 365 Education plans at http://products.office.com/en-us/academic/compare-office-365-education-p....
The initial form you fill out is pretty simple, and looks like the screenshot we've saved at http://oplin.org/files/officetrial.png.
The Executive Committee of the OPLIN Board just met by conference call and decided to keep the email transfer service running indefinitely.
We have added about 1100 transfer addresses to the service so far. Anyone who has given us their old OPLIN address and a new email address is getting their _NEW_ incoming OPLIN email automatically forwarded to their new address.