SmarterTools Inc.
24
Freeware
SmarterMail Sync for Outlook 2003 delivers Exchange-level email server software.
1
Google, Inc.
585
Freeware
Use Microsoft Outlook as a client for G Suite email, calendar, and contacts.
10
Google, Inc.
2,207
Freeware
Use Microsoft Outlook 2003, 2007, 2010, 2013 and 2016 with G Suite.
8
Google, Inc.
13,851
Freeware
Hosted by Google to streamline setup, minimize maintenance, and reduce IT costs.
4
Microsoft Corporation
106
Freeware
Provides the latest updates to Outlook 2003 with Business Contact Manager.
Individual Software, Inc.
53
Commercial
Provides you with the guides and tutorials to help you learn Outlook 2003.
99
Veign
71
Freeware
A tool to let you decide which Outlook-blocked attachments are safe to open.
22
Google
4,620
Freeware
It is a useful calendar with many customizable features and a nice interface.
Plaxo, Inc.
28
Freeware
It is a nice and easy to manipulate program with many features.
424
Google, Inc.
1,181,238
Freeware
Back up files from your computer, camera, or SD cards to the cloud.
1
Google, Inc.
8
Freeware
Google Apps Sync for Microsoft Outlook allows you to use Microsoft Outlook 2003.
79
4Team Corporation
4
Shareware
Sync Outlook folders between computers, share Outlook, sync Google contacts.
17
WebGear, Create Software, Stru.be
2,221
Open source
GO Contact Sync Mod can sync your Microsoft Outlook contacts with Google Mail.
CompanionLink Software, Inc.
Freeware
sync google calendar with outlook.
Totalidea Software New Zealand Ltd.
6
Backup your Outlook 2003 and Outlook 2007 data and settings easily.
SDMD GmbH
25
Freeware
It is a freeware addin for Microsoft Outlook 2003 and Microsoft Outlook 2007.
RemoteCalendars
13
Open source
RemoteCalendars is a COM-.NET Add-in for Outlook 2003/2007, written in C#.
Daniele Tiles,Gabriele
1
Freeware
It's a simple COM-.NET plug-in created for Outlook 2003.
2
BitLaboratory
Attractive Outlook 2003 style navigation bar and header.
Nicolas Sivridis
4
Freeware
Jello Dashboard is a Getting Things Done solution for Microsoft Outlook 2003.