Excellent 'Outlook & Email Tools' sites.

Windows/Mac OS X only: Online and desktop calendar-syncing application Calgoo Connect—along with all of the other calendar tools available from Calgoo—are now free. Calgoo Connect syncs Outlook on Windows or iCal on OS X with popular online calendars, namely Google Calendar and 30 Boxes. Granted, syncing Gcal with Outlook is pretty well covered with previously mentioned Google Calendar Sync, but Mac users haven't had a free solution for Gcal-to-iCal sync, which makes the free offering from Calgoo a godsend. All Calgoo products are now freeware, Windows and Mac OS X
Penetration:  
Bookmarked: September 15, 2009 00:09:05 · Details
URL: lifehacker.com/399211/calgoo-goes-free-syncs-desktop-calendars-with-google-calendar

Windows only: Create new appointments in Outlook with plain English using freeware application Easy2Add. Similar to Google Calendar's Quick Add feature, just invoke Easy2Add (it comes in either system tray or Vista sidebar form), enter in a simple sentence like "Meeting with Gina on Monday at 2pm," and the application automatically translates and adds the event to your Outlook calendar. The application supports one-time events, recurring events ("every Tuesday"), and user-definable defaults for setting length of appointments if not specified. Easy2Add is freeware, Windows only.
Penetration:  
Bookmarked: September 15, 2009 00:09:39 · Details
URL: lifehacker.com/395012/easy2add-creates-outlook-events-from-plain-english

Sure, normal people only need to be connected to one Exchange server or have open only one instance of Outlook. I guess that means I am not normal! I have
Penetration:  
Bookmarked: September 19, 2009 17:09:01 · Details
URL: www.makeuseof.com/tag/open-two-different-instances-of-outlook-with-extraoutlook

Windows only (with Outlook 2003 or 2007): Outlook Connector, a free plug-in we previously mentioned, has left beta with claims of better stability and syncing.
Penetration:  
Bookmarked: October 01, 2009 12:10:35 · Details
URL: lifehacker.com/5112251/office-outlook-connecter-out-of-beta-with-better-syncing

Share your Outlook pst files with your colleagues - SynchPst makes sharing personal folders quick and problem-free. Synchronize pst files among different PCs, and share your contacts and calendars without having to copy and paste. SynchPst is the Outlook addon you've been looking for!
Penetration:  
Bookmarked: November 09, 2009 02:11:48 · Details
URL: www.synchpst.com/product.htm

Mail utilities for Microsoft Outlook
Penetration:  
Bookmarked: November 10, 2009 00:11:11 · Details
URL: www.slipstick.com/addins/mail.htm

Outlook Tips : Using Command lines:: Here is how to use command lines for switches.
Penetration:  
Bookmarked: November 10, 2009 00:11:29 · Details
URL: www.outlook-tips.net/howto/commandlines.htm

How to synchronize Microsoft Outlook data between two machines or between Exchange Server mailbox and public folders
Penetration:  
Bookmarked: November 10, 2009 23:11:39 · Details
URL: www.slipstick.com/outlook/sync.htm

Utilities, how to's, code samples, discussions, chats, and other resources and other solutions for Microsoft Outlook and Microsoft Exchange
Penetration:  
Bookmarked: November 10, 2009 23:11:48 · Details
URL: www.slipstick.com

How to share contact and calendar information in Microsoft Outlook
Penetration:  
Bookmarked: November 13, 2009 18:11:12 · Details
URL: www.slipstick.com/outlook/share.htm