From the release notes...
http://downloads.scalix.com/rn/scalix-activesync-1.0.0-GA-releasenotes.html
The following EAS features are not supported in Scalix ActiveSync 1.0 and will be part of a later release:
* General
o Client certificate/SecurID authentication
o HTTP redirection and Autodiscovery, forwarding a user to another, closer server
o Optimized V12.1 Sync features, support for wait, limit and partial elements
o Optimized V12.1 HTTP use (URI format changes, elimination of HTTP headers)
o Accessing Documents on File Shares
o Browse File Shares and URIs
* Email
o Synchronization of public folders
o Flagging of Email messages
o Device-side Out-of-Office settings
o Secure MIME (S/MIME) support in synchronization (2.5, 12.0, 12.1)
* Calendaring
o Attachments for appointment objects
o View of attendee status for meetings
o Reply/Reply-All/Forward in an appointment
* Contacts
o Images and Pictures in Contacts
* Tasks
o Generally 2-way task synchronization
o Support Outlook 2007 To-Do list view
* Folder Management
o Create, edit, or delete folder hierarchy items
* Search
o Support for keyword mailbox search (12.0, 12.1)
o Support for advanced mailbox search (12.0, 12.1)
o Support for document library search (12.0, 12.1)
* Management
o User Policy settings for ActiveSync and Device settings including Password reset, Device wipe and attachment download controls
o Send device information to support user self-management (12.0, 12.1)
o Ensure compliance with reporting and monitoring functionality (2.5)
o Support Systems Management Server (SMS) notifications (2.5)