You can set up Exchange ActiveSync email or Office setup 365 mail on Windows Mobile.
It helps you to access and synchronize your email, calendar, and contacts.
If you only want to use email, you can set up POP or IMAP email on Windows Mobile.
For complete application visit office.com/setup
How to Set up Exchange ActiveSync Email on Windows Mobile?
Go to Start > Messaging > Setup E-mail.
Enter your email address and password, and then tap Next.
Check box Try to get e-mail settings automatically from the Internet, and then tap Next.
Select Exchange server for Your e-mail provider. Select Next.
Enter email address, Select Next.
Tap in the Server box and enter your server name, and then tap Next.
(for Office 365 email, use outlook.office365.com for your server name)
Enter your user name and password, and then tap Next.
Select the check boxes for the types of items you want to view on your device, and then tap Finish.
for more details, visit : Office.com/setup