Hi Jason,
Windows share in the global smartphone market is less than 1% (according last news), with those numbers we can't simply spend time upgrading the app to support Windows devices.
We did some estimations, and doing a windows version compatible it's a lot of hours of development.
We are aware that a lot of universities are going to Microsoft services, but that doesn't mean that the people is going to switch to Windows phones.
So, unfortunately, if the trend continues we won't we working in a windows version soon.
Juan