DayOne is a user friendly and intuitive portal based on a windows service running in Microsoft Azure cloud that connects to and synchronizes objects between Office 365 tenants you target. You can access DayOne using a web browser from your computer or your mobile device. DayOne enables you to configure connectivity using “connectors” with your company and your partner’s Office 365 tenants. Each connector defines the direction of objects synchronization (e.g. from your partner Office 365 tenant to your company Office 365 tenant), so your users will be able to see your partner’s users in Outlook / SharePoint / Teams seamlessly as if they were part of your company. You can also enable object deletions, so once users in your partner organization leave they will be deleted from your tenant as well. DayOne also handles automatically guest user invitations without bothering users with the need to accept these that is usually required part of the out-of-the-box Azure B2B collaboration process. The form of displaying the users of your partner is also at your control, so you can align your partner users’ display name with your naming conventions (e.g. First name, Last name) and vice versa. If required, you can add prefix or suffix to your partner’s user objects as displayed in your directory to help your users distinguish them and internal employees.