Very nice app for connecting with Exchange Server, features:
Read and compose Outlook emails and manage your calendar directly from any iOS device. No more using the web browser to access your Outlook account!
MULTIPLE ACCOUNTS now included. Access multiple mailboxes and calendars. Great for quickly combining all of your email addresses.
(Exchange 2013, 2010, 2007, 2003
Office 365 business, Gmail, Outlook.com, Yahoo, AOL, and more)
-Read and reply to all Outlook email (includes subfolders)
-Open and forward attachments
-Compatible with PDF, XLS, DOC, JPG files
– Rich HTML Text Editing
– Out of Office
– Scheduling Assistant
-View, create calendar events (and reminders)
-Search Exchange Global Address Book
-Access contact details (name, tile, phone)
-Landscape mode (great for iPad)
-User-friendly design with easy navigation
-Excellent customer support
-Signature feature available
-Passcode protection for extra security
-Works on iPhone, iPad over 3G or WiFi
-Connect to Microsoft Exchange 2003, 2007, 2010
-Compatible with Microsoft Office 365, Gmail, Outlook.com, Yahoo, AOL
You can find it here.