25GB for free mounted as drive T in windows explorer: Telekom Mediacenter
If you speak german or can translate the following german site, you can use this unique offer:
http://dsl-und-dienste.t-online.de/mediencenter-die-online-festplatte-fuer-fotos-und-dateien/id_12646830/index?aktreiter=3
For mounting the 25GB as a local drive it is necessary to download and install a little application.
You can also access your files from your iPhone or Android mobile device.

You can sync e-Mail-signatures & IE-favorites, but not in Win XP and no Sync of Outlook-contacts
It should be possible to synchronize the Outlook-contacts in the pst-files of the company- and the private computer, or to sync the Live-Hotmail-Contacts in Outlook with the contacts in other outlook-contact-folders, or the Gmail-contact-folder in Outlook with another contact-folder in Outlook.
Only for Win7, Vista, Win Server 2008, NOT for Windows XP!
If you need a syncing-solution for Windows XP, you need SugarSync or DropBox or SpiderOak.

With Windows Live Mesh 2011 you have again 5GB free storage, but no file sync with WM as with SugarSync
Now Windows Live Mesh 2011 seems to offer again all features from the old MS Live Sync and has the ability to sync up to 20 folders with 20,000 files for PC-to-PC synchronisations (see http://www.windowslive.de/Mesh/Funktionen.aspx ).
This is good, but in my opinion not as good as the service from SugarSync, see my comment from Nov 2010:
Feature comparison : Sync with Live Mesh / Sync with SugarSync
Max. Online storage: 5GB / Up to 10GB and more (with Registry about http://bit.ly/bxgp6f until Dec.31th, 2010)
Windows Mobile File-Sync: Not at present, maybe later / The SugarSync FileSync works perfectly between iPhone, BB, Android, WM and Desktop-PCs, Microsofts Live Mesh has no plans to sync files with other mobile devices than Windows Mobile or Windows Phone 7.
Availability of the Sync Service is better with SugarSync than with Live Mesh:
On Dec.12th, 2010 I tried to join to the new Live Mesh 2011 Service (until now I tested MS Live Sync and the old Live Mesh), but this was not possible. I got the error-message:
"Actually no new users can register to Live Mesh. Try it again in a few days!". ScreenShot see http://bit.ly/hrP0mC

To @em4020, and others, I have the following question:
is there an alternative to Windows Live Mesh nowadays, that also offers free unlimited data sync between computers, without requiring online backup, like most or all listed "alternatives" do ?
I mean, FolderShare / Live Sync / Mesh have the great advantage that you can (for free) sync as much data as you want, and it doesn't REQUIRE you to put all that data online (which I don't).
All I want is the data to sync between several PCs. Oh, and also to allow syncing to computers owned by a few other people. With Live Sync this was really great, especially that you could give people "read-only" access to a synced folder; unfortunately with Live Mesh 2010 you must give RWXD rights to everybody, which makes it too risky for me to use with other people (e.g. if they move or delete a file, it's gone from my PCs as well).
So I'm looking for alternatives...

I gave up on Live Mesh, which I used for some time (see below), since Microsoft dropped it for Live Sync. Switched to Dropbox.

SpiderOak starts with 3GB instead only 2GB (Live Mesh) online storage for free
Before "Live Mesh" has been replaced by "Live Devices" in MS Live wave 4 (Live Essentials 2011) Live Mesh was the only Online Sync service providing 5GB online storage for free, if you used MS Internet Explorer and not Firefox.
Because since summer 2010 MS Live wave 4 provides only 2GB online storage for free, now you have 3 reasons, why it is better to change to SpiderOak (3):
(1) SpiderOak works without problems also with FireFox, not only with MS Internet Explorer
(2) SpiderOak starts with 3GB online memory for free, if you download the SpiderOak application with the Bonus-Registration-Link, without Bonus-Registration-Link you start SpiderOak only with 2GB for free.
(3) In DropBox you can only synchronize one directory with sub-directories
With SpiderOak you can synchronize as many different local directories as you want

Because I needed more than 2 GB online memory, I use DropBox (with FireFox) and additionally registered a SpiderOak account, which provides 3GB initial online space if you download the SpiderOak application using the long (1) or short (2) SpiderOak Bonus-Registration-Link:
(1) https://spideroak.com/download/referral/11ae56d2017b64ccb8b010aa0131d99a
(2) http://fwd4.me/FBP
(3) http://alternativeto.net/desktop/spideroak/

"Live Mesh" will be replaced by "Live Devices" in MS Live wave 4 (Live Essentials 2011) , same functionalities, better performances but the online storage part now uses SkyDrive instead of Live Mesh server and it's limited to 2GB on the 25GB of your skydrive (instead of 5GB with live mesh)
There is also a IE and Office settings sync feature & remote desktop connexion like LogMeIn

Dunno what happened with TheSmartGuy's setup, but I've been using Live Mesh successfully via Firefox for going on two years now.

I really love Live Mesh. The only thing that disappoints me is that I can't find a way to BUY more storage space. I hope that comes soon, this service is worth money!

I would echo jfederline. I've tried four or five sync applications, and found Live Mesh to be the best. If Dropbox offered the option to sync any folder on my hard drive, I would consider it. Until then, I'm sticking with Live Mesh and hoping that MS continues to develop it.

I am not happy, that Live Mesh, SpiderOak and DropBox have no "Windows Mobile" applications for the synchronizing with "Windows Mobile" devices.
For this purpose I prefer SugarSync.
http://alternativeto.net/mobile/sugarsync/
http://alternativeto.net/desktop/sugarsync/
The advantage of Live mesh over SugarSync is its greater free online storage:
Live Mesh has 5 GB free, SugarSync only 2 GB.

I really liked this until it started to randomly delete files in the cloud. This problem seems to happen quite often so I'm waiting for the proper version.

I've used Live mesh for about a year now, and it's been great. It synchronizes my home desktop, notebook, and work computers. The ability to use multiple arbitrary folders is a must-have, for my purposes. My only frustration is that it's one of several Microsoft solutions for cloud synchronization, which is needlessly confusing from a customer perspective, and dilutes what should be a sizable client base. Anyway, a must-install for me.

With Live Mesh You can sync many free choosable folders, not only one as with DropBox: http://alternativeto.net/desktop/dropbox . As an additional advantage Live Mesh has 5GB (instead of only 2GB with DropBox - ) free online storage. Little Disadvantage: Online Device Connecting ( https://www.mesh.com/Web/Devices.aspx ) with firefox gives the Error:
"Sorry, your web browser does not currently support Active X controls. This Active X control is only needed if you're trying to connect to a remote device from your Live Desktop. You can still connect to a remote device in your mesh by using the Live Mesh notifier on your device."