Yes, see the Knowledgebase article on this topic.

Yes, even if you don't have an Exchange server, you can use Sync'Em to create shared calendars with calendar events that are shared across iCal calendars on multiple Macs. For details, see our Knowledgebase article on creating shared calendars.

While manually maintaining separate copies, it's easy to have created duplicate and/or slightly different copies of what were meant to be the same entries. There are also scenarios where a corrupted OS X's Sync Services can result in duplicate iCal entries which can then get sync'd to other information sources.

There are 3 strategies for removing duplicates:

1. manually delete the duplicate entries in one information source and those deletions will then be sync'd (subject to your setup options) with the other information source(s) during the next sync
    
2. if applicable, use one of the resources mentioned at
   http://www.nhoj.co.uk/icaldupedeleter/ or
   http://www.hawkwings.net/2006/05/16/ical-de-dupe-kill-ical-duplicates/
    
3. for advanced users: if all the information exists without duplicates in one of the information sources, you can do the following:
• if you're not familiar with the Advanced Setup, you'll need to download and watch the tutorial video
• check/enable the "Show Advanced Sync Setup" option via the "Preferences" tab in the Sync'Em preferences
• to be able to recover from any problem, make a backup of each source that contains all the entries and, for extra "insurance," of all the other information sources
• via the Advanced Setup, for each of the other Sync Sources (i.e., the ones with duplicate entries):
• in that information source, delete all the entries
• make note of that source's "Sync Source" and "Access Sync Source Prefs" settings
• delete then re-create both that source's "Sync Source" and "Access Sync Source Prefs" settings
• at the next sync, those reconfigured sources will be sync'd as initial/full syncs (subject to your setup options) with the contents of the other/full/non-duplicate source(s)

You may also want to see the FAQ about duplicate contact entries.

See the Knowledgebase article on this topic.

If you have created an Exchange calendar or contacts folder, you'll need to specify the calendar or contact folder's pathname, not just its "simple" name, when using setting up. The Setup assistant automatically handles this for you, except that some public Exchange folders may not be shown — see the Knowledgebase entry on Exchange public folders for more information.

E.G., You've created an Exchange calendar named "Home" and you want to sync that calendar's events in addition to (or instead of) the default Exchange calendar folder named "Calendar". To specify that "Home" calendar, you'll need to specify the "Calendar Folder Name" as "Calendar/Home". This is not something you "see" via OWA — the best hint is that OWA will show the folder as ".Home" in the "Choose folder to delete" pop-up. Fortunately Sync'Em will usually show you the folder names.

In the OWA graphic below, the calendar folders that appear to the left as "Home" and "Work" and in the pop-up menu as ".Home" and ".Work" are actually the pathnames "Calendar/Home" and "Calendar/Work", respectively. Contact folders are similarly named.

Click on the graphic for a full-sized view.

Understanding the way Exchange folders are named can be useful when setting up shared folders or public folders that are not reported to Sync'Em by the Exchange server. If Sync'Em does not automatically present an Exchange folder for selection, you'll need to select "Enter path manually..." entry (in the pop-up selection menu) then manually enter the Exchange folder pathname.Click on a graphic for a full-sized view.To enter an Exchange folder pathname manually: then: