Gmail offers both POP and IMAP e-mail access. Though both POP and IMAP enable you to access e-mail through Microsoft Office Outlook Mobile, using IMAP provides more benefits. With POP you can only download e-mail from your Inbox to your Windows Mobile phone. Any changes that are made to your phone’s mailbox will not be reflected in your Gmail account and vice versa. For instance, if you create a folder in Office Outlook Mobile, the same folder will not be visible in your online Gmail account, and vice versa. However, with IMAP you will see folders that you create in Office Outlook Mobile and folders that you create in Gmail. You don’t need to sort e-mails into various folders in Outlook Mobile if you have already done so in your Gmail account. Also with IMAP, if you check your e-mail on multiple devices, you can view the latest e-mail from any of the devices.
Scenario 1 explains how to configure your Outlook Mobile for POP access, and Scenario 2 describes the IMAP access. You can use either of these two options to access your mail.