The Exchange Server 2007 Availability service improves free/busy data access for information workers by providing secure, consistent, and up-to-date free/busy data to clients that are using Avai...
Updated Jul 01, 2019
Version 2.0
Blog Post
Hi Mike,
Glad you liked the blog. Good question.
So to allow for availability lookups between two Exchange 2007 organizations, you need two things:
1. Representation of the objects in the directory.
2. Add an availability space for the target SMTP domain. You do this by using the Add-AvailabilityAddressSpace task. You can find more information in the Online help about that task, along with examples.
Once we have this information here's what happens:
1. User performs a F/B lookup for a user that is not in the same organization.
2. Availability Service finds the availability space for that SMTP domain space.
3. Availability services talks to the target domain's AutoDiscover service to determine the Availability Service URL responsible for the target mailbox.
4. Either source user's credentials are used (trust scenario) or a service account's credentials are used (non-trust scenario) to perform the F/B lookup.
Ross
Glad you liked the blog. Good question.
So to allow for availability lookups between two Exchange 2007 organizations, you need two things:
1. Representation of the objects in the directory.
2. Add an availability space for the target SMTP domain. You do this by using the Add-AvailabilityAddressSpace task. You can find more information in the Online help about that task, along with examples.
Once we have this information here's what happens:
1. User performs a F/B lookup for a user that is not in the same organization.
2. Availability Service finds the availability space for that SMTP domain space.
3. Availability services talks to the target domain's AutoDiscover service to determine the Availability Service URL responsible for the target mailbox.
4. Either source user's credentials are used (trust scenario) or a service account's credentials are used (non-trust scenario) to perform the F/B lookup.
Ross