Open Outlook and select File.
Open Outlook 2010 and select File
Click Add Account.
Click Add Account
Check Manually configure server settings or additional server types
Click Next
Manually configure server settings in Outlook 2010
Select Internet E-mail
Click Next
Select Internet E-mail
Enter Your Name and E-mail Address
Choose IMAP as your account type
For Incoming mail server (IMAP), enter imap.one.com. For Outgoing mail server (SMTP), enter send.one.com
In Logon Information enter the e-mail address and password that you created in the control panel
Configuration of the SMTP server in Outlook 2010
Click More Settings
Enter your name and username and password
Select Outgoing Server and then My outgoing server (SMTP) requires authentication
The SMTP-server requires authentication
Select Advanced.
For Incoming server (IMAP) enter 993 and select SSL.
For Outgoing server (SMTP) enter 465 and select SSL.
For Root folder path enter INBOX with uppercase letters.
Click OK
Setting up IMAP and SMTP
Click Finish