I know that I can use segmentation to control which specific Exchange Server features are available to Outlook Web Access (OWA) users. Does Outlook Mobile Access (OMA) provide similar controls?
At present, OMA doesn't offer a subset of its functionality. By default, Exchange Server 2003 ships with OMA disabled; after you enable this feature, users can access all its functionality. Microsoft designed segmentation to be an OWA-only capability, so if you enable this feature on servers running OMA, you might encounter unpredictable (and hard-to-troubleshoot) OMA behavior.