Open Outlook and select File.
Click Add Account.
Check Manual setup or additional server types and click Next.
Select POP or IMAP and click Next
Enter Your Name and E-mail Address.
Select 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.
Click More Settings.
Select Outgoing Server and check My outgoing server (SMTP) requires authentication.
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 and then Next.
You have now set up your account in Microsoft Outlook 2013. Click Finish.