Configuring preferences and options in Outlook.com
There were suggestions here that this problem was resolved with the upgrade to the new Outlook Mail. I'm here to tell you it is not. The font keeps changing to the default in the middle of my typing an email. Sometimes even in the middle of a word! It frequently happens when I backspace to correct a mistake. I have had the upgrade (snort) for several days now, and it at first seemed fine, but today it's as bad as ever been. I have reset the font and size I wanted in Options, but I have to manually change it while typing the email. I will try the suggestion of signing out then see what happens when I sign back in.
Overall, I'm unhappy with this upgrade. The Calendar is really screwy.