Microsoft looks to mobilize with Exchange SP2.

"New mobile messaging tools in the Exchange Server Service Pack 2 (SP2) will help hardware partners and content providers deliver a device that 'meets the demands of the end user for a rich mobile messaging experience.'

For example, new direct push technology eliminates the need for SMS to notify and ensure that a mobile device automatically retrieves new e-mail from an Exchange server. SP2 uses an HTTP connection to push new e-mail messages to the device.

The new version also provides greater control over mobile device security, including policy settings that let a user unlock a device with a password; local wipe, which dictates how many incorrect log-on attempts are permitted before your data might be at risk; and remote wipe, which allows administrators to remotely delete information from lost or stolen mobile devices."