ARCHIVED: What functionalities available in Microsoft Outlook 2003 are not available in Outlook 2007?

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Warning: The file format used by Office 2007 documents is incompatible with older versions of Office, including Office 2003. For ways to open Office 2007 documents without installing Office 2007, see ARCHIVED: If I don't have Office 2007, how can I open Office 2007 documents? The Student Technology Centers (STCs) at Indiana University Bloomington and IUPUI are now running Office 2007.

Feature	Description	Reason for change	Migration path, if applicable
ACT! and Schedule Plus	No longer supported	No longer used or has other supported import mechanisms	Use a previous version of Outlook to import the data into a `.pst` file for Schedule Plus import, and use that `.pst` file in Outlook 2007.
Attachments	New user interface and enhanced functionality; can now preview attachments
Calendar	New Week view Free/Busy bar does not show on Calendar items if item is Busy Meeting icon is removed from Calendar items Default detail level of Month view is changed	Simplifies Calendar interface and allows more text to appear on Calendar items
Email categories	Categories no longer assigned to incoming mail, and are not automatically reassigned to replies and forwards	Categories visually louder with Colored Categories feature; categorized mail often perceived as spam
Forwarding out-of-date meeting requests	If you try to forward an out-of-date meeting request, Outlook automatically sends the most recent copy of the meeting.	Prevents out-of-date meeting requests
MAPI DLLs	User interface and functionality for MAPI DLLs are separated, with functional DLL installed in a language-agnostic folder under OfficeVer. No effect on end users. ISVs must use LoadLibrary and the default search path to load the Outlook MAPI Provider. If they do not, the ISV is broken.	Smaller Language Interface Pack (LIP) downloads	To load the Outlook MAPI Provider, use LoadLibrary and the default search path.
Non-delivery receipt	When a mailbox is full, submission fails on the client side rather than on the server side; recipients still receive a message stating mailboxes are over the message limit.	Change made in response to customer feedback
Personal Address Book	Personal Address Book, an ANSI address book (part of Outlook 96) removed, replaced by Outlook Contacts in Outlook 97. Personal Address Book entries were stored in the local computer files with the extension `.pab`. Outlook 2007 does not support `.pab` files.	Outlook Contacts provides more functionality than `.pab` files.	During configuration, all contacts in the Personal Address Book are migrated to the default Outlook `Contacts` folder. You can choose to move your contacts to a different folder, or cancel the migration and import the `.pab` file later. The `.pab` file continues to exist in the file system, but the Personal Address Book is not accessible from Outlook. You cannot re-add the Personal Address Book, because Outlook does not provide this as an option in the email account configuration.
Reply in IRM email	Replies to protected email messages in Office 2007 contain the original text. The replier can add comments, but cannot extract the original content. When a user replies to a Do Not Forward email message, the original content is preceded by a yellow bar telling the user what actions can be performed. Users can still view and respond to all protected email received from earlier versions of Outlook.	Customers' request, so as to provide feedback to protected email	Install Office 2003 Service Pack 2 or the Office 2007 release.
Scripting agent	Using Outlook to administer Exchange Server scripts is possible only by downloading the `Scrptxtn.dll` file from the Microsoft Download Center	Low-use feature	Download and install `Scrptxtn.dll` from the Microsoft Download Center.
Security settings	Security settings (formerly in Tools menu's Options) are now in the Trust Center	Aggregates security settings in a single location
Show Views in Navigation Pane	Moved to View > Navigation Pane > Show Views	Consistency