I can confirm I'm now getting this issue after updating the dlls from 3.1 to 3.2.1.
Code is:
SmsMessage smsMessage = new SmsMessage(mobileNumber, message);
smsMessage.Send();
Now throws a null reference on the From. OutlookSession.SmsAccount.Phonenumber is blank on the device I'm using so I can't use the new Recipient workaround.
Having to set the phone number of the device for each of the 40 devices (in the config I'd think) that we're rolling out to is a pretty prohibitive installation overhead.
Any chance you know what was changed between versions that could have caused this, to fix it?