This is just something I thought I'd share with Teh Wild Interwebs out there.
The short version: Evernote for Windows synchronization works only if Internet Explorer can access the web.The long version
I use a pretty cool web service called Evernote. It has a desktop version too, for Windows and for Mac. To upload "notes" into it (such as images or text documents), I drag-and-drop them to the Evernote For Windows (the desktop application). At regular intervals Evernote synchronizes the local versions of those notes with the versions stored on Evernote Web. That way those notes are accessible to me anywhere over the web browser.
Sometime in the future I may blog about Evernote some more, once I figure out how to use it in ways that would totally enhance my life and scrub my kitchen sink. I've been doing that for the last few months a bit too sporadically, so I still haven't reached definite conclusions.
A couple of months ago for no good reason the Evernote desktop application stopped synchronizing with the web. Whenever I pressed the Synchronize button, I would get a message "Syncronization Failed". Not informative at all. Evernote.com support pages didn't reveal any clues, so I contacted their tech support. After a couple of back-and-forth emails they suggested I check whether I can access Evernote URL from Internet Explorer. Specifically from IE, not Firefox. So I did. And sure enough, IE said it was in Offline Mode. Once I unchecked the Offline Mode, Evernote synchronization started to work. So it turns out Evernote for Windows is dependent on IE. Who woulda thunk?
It should be mentioned that their tech support was fast and efficient in solving my problem. Very nice of them, considering that they are not making any money off of me (Evernote's basic service is free).