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We've been tangling with Exchange lately and I wanted to throw this out there in case anyone on the list had any ideas. Thanks in advance for any advice or pitying glances you can throw my way. Client environment is AD domain with Office 2007 and 2008 deployed. Server is Exchange 2007 SP1. Primary email addresses are firstname.lastname@domain, but logon is [log in to unmask] PC users cannot see certain Mac users' calendars / free-busy information. When a PC user looks at free/busy information, the availability service returns an error. Other Mac users can be seen by the PC users. The commonality between these users is that the Mac users that can be seen have used Outlook on a PC in the past. Additionally, Exchange isn't creating legacy free/busy mailboxes for users that haven't logged on through Outlook, even though I was under the impression that the free/busy service was supposed to crawl calendar data and create those automatically for legacy use. (to provide legacy compatibility with calendar entries made on OWA / Entourage) PC users can see Mac calendars when in Online mode, but still can't see free/busy information unless that Mac user logs in with Outlook on a PC to create a legacy free/busy mailbox. Once the legacy mailbox is created, the Availability Service returns the proper free busy information. Questions: why does a legacy free/busy mailbox need to exist for proper Availability Service functionality; why can PC users only see Mac calendars in Online mode, not in Cached; does the free/busy service on the Exchange server only update legacy mailboxes or can it be used to create them for Mac / OWA clients. From reading the Microsoft documentation it looks like everything is set up as it's supposed to be, which is where I hit the wall. Thanks, ---- Jack Kramer Computer Systems Specialist University Relations, Michigan State University w: 517-884-1231 / c: 248-635-4955