Hi. I have a fellow in my office who work on Linux laptop. His account was on PREM and he use EWS setup for Thunderbird. All works fine until we have move his account to cloud. Microsoft doesn't like to help me as you are not support EWS only IMAP/POP3. My question is if this EWS works fine before we have migrate fellow to cloud on your Thunderbird, why stop work with new cloud account? Can you help us with this? Thanks Pete