To setup a mailbox using IMAP in oulook.com please follow the instructions below, the details to use for your mailbox can be found
here.
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[*]Go to
Settings > Connected Accounts

[*]Go to
Add a connected account > Other Email Accounts and then fill in your mailbox details and select the desired default behaviour and tick the manual configuration option:
[list]
[*]Display name:
[*]Email address:
[*]Password:
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[*]Select IMAP/SMTP connection settings
[*]Complete the mailbox details and then complete the IMAP and SMTP server details and click 'OK' and the mailbox will be validated:

[*]You will receive a confirmation message and you are setup: