Outlook Mobile Service (OMS) is a feature in Microsoft Office Outlook 2007 and 2010 that you use to create and send text messages to a mobile device from within Outlook in a manner similar to e-mail messages.
Two ways to communicate with your colleagues, prospects, and clients are e-mail messages and your mobile phone. Both have their advantages, but managing your contacts, correspondence, and appointments by using two different media can be inconvienient.
Outlook Mobile Service makes it easier to use both media and is completely integrated with Outlook. With Outlook Mobile Service, composing and sending a text message is now as quick and easy as creating and sending an e-mail message. After the message is sent, you can see it in the Sent Items folder in your Inbox and in Messageport. In addition, you can receive replies from your messages directly in your Outlook Inbox.