For many offices, the most frustrating experience related to Microsoft Outlook is finding out that, unless you are using Microsoft Exchange Server, there is no simple, built-in, reliable method for sharing contacts and calendars. That's right, there's no "magic wand" you can wave to enable people to easily share Outlook data without Exchange.
Some of the tools for synchronizing Outlook data via the Web also allow other people to access the information.
Outlook 2007 and up can use Outlook.com accounts to store and sync their appointments with the Outlook.com calendar, using any Microsoft Account. The calendar can then be shared with anyone who has a Microsoft Account.
The services on this page offer at least some sharing.
Sync Outlook using Sync2 for Microsoft Outlook without a server. Sync Microsoft Outlook with Google Calendar, and Android phone. Synchronize Microsoft Outlook between multiple PCs using an external USB device, shared network folder of FTP. Share Outlook Calendar with Google Calendars. Sync Outlook Calendar, Contacts and Tasks folders. Includes improved product installation process and first start user experience. The update comes with improved performance of the software. Try the new Sync2 2.86 version now.
Share and synchronize Microsoft Outlook Personal Folders on multiple PCs without a server. Sync2PST is a PC application that allows you to synchronize Microsoft Outlook PST files. Synchronizing automatically or manually any of your Outlook folders between two or more computers. Sync Outlook .pst data file using USB device or shared network folder and shared PST file. Automatic background synchronization, even if Outlook is not running. One or Two-way PST file synchronization.
EZOutlookSync will keep 2 or more copies of MS Outlook always up-to-date. EZOutlookSync will transfer only changed data, making synchronizations real quick and unobtrusive. Works on Outlook 2000/2002/2003.
Set of intranet collaboration applications that offer synchronization with Outlook. Available for local server installation and as a hosted application.
SynchPst for Outlook synchronizes data between personal folders. Choose either single or multiple folders, with or without subfolders, and synchronize them quickly and efficiently.