Outlook 2011 receives more changes than the PowerPoint or Word. The Outlook database has been changed, and therefore the database is rewritten when a user first runs an upgraded copy of Outlook, which can be a lengthy operation depending on the size of the database.
The changes are said to increase the robustness of the database and to improve the effectiveness of the rebuild utility. Other changes fix a range of issues that could cause database corruption, instability or crashes.
IMAP support is improved, particularly for Gmail users. The update also includes a new way of synchronising with Exchange accounts. Distribution lists can be expanded, and improvements have been made to calendaring.
There's no indication of a fix for the long-standing (back to Entourage) bug that causes Outlook to ignore the start or end of daylight saving time unless the program is relaunched.
Page 2: Word, PowerPoint, Excel.
PowerPoint 2011 now supports Lion's full screen view and Paste Special for hyperlinks. It also correctly displays the list of co-authors.
Changes to Excel 2011 are limited to specific bug fixes.
General changes to the suite include improvements to SkyDrive and SharePoint integration, and fixes for the German and Italian grammar checkers to help ensure the complete document is checked.
A separate update improves Office's Error Reporting utility.