Has your hotmail account been migrated to the new Microsoft Exchanger server?
To find out if Microsoft has migrated your account yet - in a Browser, login to your account at outlook.com. When your mailbox has been migrated to the new infrastructure, the top left corner will show Outlook Mail. When your account hasn’t been migrated yet, it will show Outlook.com.
If it shows Outlook Mail , you need to set up your account in EM client as an Exchange account. iMAP will still work, but not as well as Exchange (also Calendar and Contacts are not synced with iMAP). An EM Client Outlook account (ie using AirSync)will no longer work.
Note that when you set up an Exchange account, EM Client can take quite a few minutes to obtain the server details.
See this relevant doco
https://drive.google.com/open?id=0B8ey_8poDxPUQV85WmU3bjNobVk