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.
Tools in the Spotlight
Synchronizing Outlook data between sources made easy with Sync2 Cloud, powerful Microsoft Outlook synchronization tool. Sync Outlook folders (Calendar, Contacts and Tasks) between single or multiple sources and accounts. Sync Outlook with iCloud, Google, Microsoft Exchange and Office 365 accounts. Synchronize Outlook 2016, 2013, 2010, 2007
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.
CodeTwo Public Folders will let you share Outlook between many computers. It's an easy and cost-effective Exchange Server or Office 365 alternative which allows you to sync Microsoft Outlook data automatically and across various Outlook platforms and users. New features include: Internet sync (or LAN sync), all data is kept locally (no cloud storage). File sharing capability allows you to share any files between computers. Full encryption of the sync'd data and password protection. The program is fully compatible with all latest Outlook and Windows versions including Outlook 2010 64bit.
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.
Softalk Share Server lets Outlook users natively share their Outlook folders amongst one another in much the same way that Exchange Server provides Outlook folder sharing. An administrator can control which other users have access to any of their folders (including calendars, contacts, tasks, notes, journals and email folders).
SynchPst for Outlook synchronizes data between personal folders. Choose either single or multiple folders, with or without subfolders, and synchronize them quickly and efficiently.