- Since iOS 13 Update you can't no more save drafts in the native mail app. They don't appear in the draft folder and so they don't synchronize with Exchange 2010. They also disappered from the iPhone after the Update from 12.1.2.
- Next issue is if you want to accept an invitation on your mobile phone that also doesn't synchronize with Outlook (Exchange)
Are there new Active Sync Settings, Restrictions etc?
Are you also experiencing issues with these?