Hi Normski,
Please refer to the following steps to manually configure the Office365 account in Outlook.
1. Use PowerShell connect to Exchange Online.
http://help.outlook.com/en-us/140/cc546278.aspx
2. Use the following cmdlet:
3. Then set related setting as below:
a.Go to Control Panel, and click Mail.
b.Click Show Profiles and then click Add.
c.Type a name for the profile, click OK.
d.Click to select the Manual setup, click Next.
e.Click Microsoft Exchange, and then click Next.
f.In the Server box, type e9983645-a13a-4334-8003-4f841d055318@domain.com/domain.onmicrosoft.com
g.Make sure that the Use Cached Exchange Mode option is selected.
h.In the User Name box, type your user name (for example, alias@domain.com), and then click More Settings.
i.Click Security tab, make sure you do not check the box “Encryption” and choose Anonymous Authentication
j.Click the Connection tab.
k.Make sure that the Connect to Microsoft Exchange using HTTP check box is selected, and then click Exchange Proxy Settings.
l.In the Use this URL to connect to my proxy server for Exchange box, type the host address outlook.office365.com
m.Make sure that the Only connect to proxy servers that have this principal name in their certificate check box is selected, and then type msstd:outlook.com.
n.Click to select the On fast networks, connect using HTTP first, then connect using TCP/IP check box, and then click to select the On slow networks, connect using HTTP first, then connect using TCP/IP check box.
o.Under Proxy authentication settings, click Basic Authentication.
p.Click OK two times.
q.Click Check Names. When the server name and the user name are displayed with an underline, click Next.
r.Click Finish.
Thanks,
Jason Jiang