Finally, after doing some digging, here’s how to do it:
Log on to Office 365 OWA at https://outlook.com/<your.domain>:
Once logged on, go to “Help, About”:
In the new window, look for “Host Name”:
Copy the the host name and close this window.
Now we can create a new profile in Outlook with the following configuration;
Choose to manually configure server settings:
then choose “Microsoft Exchange or compatible service”:
in the Server Settings window in the Server field, paste the name of the Host Name you copied earlier.
Now, for this to work correctly, you need to add the word “mailbox” betwin the Host name and the rest of the FQDN. So if my Host Name is “sinprd0602.outlook.com”, my Server name here should be “sinprd0602.mailbox.outlook.com”. Do the same for the name you copied:
Don’t forget to enter your Office 365 email address at the “User Name” field, then click “More Settings” and go to the “Connection” tab. Check the “Connect to Microsft Exchange using HTTP” box and click “Exchange Proxy Settings…”:
In the next window, fill the following details:
Type the Host Name you copied earlier in the “Use this URL to connect to my proxy server for Exchange” field.
Check the “Only connect to proxy server that have this principal name in their certificate” box and type: msstd:outlook.com.
Make sure both checkboxes are marked for connecting using HTTP first, and make sure you set the authentication method to “Basic”:
Click “OK” twice, then click “Check name” and enter your password at the prompt. the server and user names should be underlined:
Click “Next” and “Finish” and open Outlook, enter your password if prompted. That’s it, You’re connected!
Many organizations work with owa 2003 as their client’s mail client. In owa 2003, if you wanted, you could open as much windows as you want, each with a different mailbox. In owa 2010, If you tried that, you probably know it’s impossible. EWS 2010 will allow for only one user at a time per session. No matter if you try to use tabs, new windows – you get this annoying error:
“You may have already opened your mailbox on a different browser tab. If you feel you’ve received this message in error, try refreshing your browser.”
The first workaround was to work with different browsers, but then you get all messesd-up with IE, Mozilla, Chrome (?!) and the clients get frustrated.
So we came up with this:
If your end users can handle it (and for your IT staff), ask them to open a new session in IE:
Since most of the customers use desktop shortcuts or predefined urls in the favorites tab, the smarter solution would be to create these shortcuts with the following argument: