You can access email, instant messaging, Office documents, and other Office 365 services from your Windows Phone. Instructions for setting up your phone are included here and in the Office 365 portal. Go to Settings > Office 365 settings > Get started > Phone & tablet. Or, you can go to Software > Phone & tablet. Choose Windows Phone.
You can get apps for both SharePoint and Lync (Lync: An Office program that provides instant messaging, a contact list, audio and video conversations, online meetings, desktop sharing, and more.) in the Office 365 portal or go to the Windows Store.
Set up email on Windows Phone
With a Windows Phone 7.5 or Windows Phone 8, four Office apps are already installed on your phone: Word, Excel, PowerPoint, and OneNote.
Learn more about Office Mobile for Windows Phone.
Lync for mobile clients
Open a SharePoint site on a Windows Phone