You can edit the default sharing policy to allow all of your users to share full calendar details with people outside of your organization.
If you have not done it in the previous step, then this steps allows you to configure full calendar sharing.
When you create a meeting invitation and look at the scheduling page, if Outlook can find Free/Busy for an attendee, it displays it with blue and grey blocks (Row 1 & rows at #4).
When there are no appointments, the time line is grey during non-working hours and white in working hours.
Microsoft Outlook supports %NAME% and %SERVER% wildcards, which use the alias and domain name from an email address.
For example, when you use the URL In a SMTP address, Outlook replaces %NAME% with all the characters before the at (@) symbol and replaces %SERVER% with all the characters following the @ symbol.
This allows other Outlook users to view the Free/Busy information of others and schedule appointments with other Outlook users.