How to Enable Mailbox Features for Exchange Server 2010
Exchange Mailbox Features refers to several features of Exchange network mailboxes that are controlled via the Mailbox Features tab of the mailbox Properties dialog box.
The following paragraphs describe the features that are controlled from this tab:
Outlook web App: Lets the user access her Exchange mailbox from a web browser rather than from an Outlook client. With this feature enabled, the user can read e-mail from any computer that has an Internet connection. This feature used to be called Outlook web Access.
Exchange ActiveSync: Activates the ActiveSync feature, which allows Exchange data to synchronize with mobile devices, such as iPhones or Windows Mobile phones.
Unified Messaging: Enables a premium feature (available only with Enterprise Edition) that integrates voice mail and fax messages with Exchange mailboxes.
MAPI: Enables e-mail using the MAPI protocol. This protocol is enabled by default and is the most common way to access e-mail with Microsoft Outlook.
POP3: Enables e-mail using the POP3 protocol. POP3 is disabled by default and should be enabled only if the user will need to access e-mail using an e-mail client that requires the POP3 protocol.
IMAP4: Enables e-mail using the IMAP4 protocol. IMAP4 is disabled by default and should be enabled only if required to support an IMAP4 e-mail client.
Archive: Enables the Exchange Archive feature, which is available only with the Enterprise edition of Exchange.