Hi Per,
"Microsoft account" is the new name for what used to be called a "Windows Live ID." Currently, Office 365 account hasn’t been included in Windows Live ID. Therefore, you can use email address and password you used for other Microsoft services, like Messenger, Hotmail or Xbox LIVE, as a login account for Windows 8, rather than Office 365 account.
For more information please check the link below:
windows.microsoft.com/.../microsoft-account
As for the MS CRM Online, I’d like to know if you are referring the Dynamics CRM within Office 365 as described in the link below:
community.office365.com/.../crm-integration-with-office-365-benefits-and-installation.aspx
If not, I recommend you contact Dynamics CRM support via the following link, where located more peers and industry experts to get more out of Microsoft Dynamics CRM:
rc.crm.dynamics.com/.../community.aspx
Thanks,
Nancy Xie