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There is SharePoint and then there is Office Web Apps.
SkyDrive is "owned" by the individual - IT, HR, and Legal have no real control.
Office Web Apps through SharePoint Online on the other hand is a corporate resource.
There are differences between Office Web Apps for Office 365 and SkyDrive, some of which are outlined here:
No, they are different things.
When it comes to SharePoint, there is SkyDrive Pro. Before SkyDrive Pro, there had been being SkyDrive. Please see article What's the difference between SkyDrive and SkyDrive Pro?
And you can get more information about SkyDrive Pro from here http://sharepoint.microsoft.com/blog/Pages/BlogPost.aspx?pID=1015.
It's more likely you are confused about SkyDrive Pro and SharePoint Online.
Please see What is SharePoint?
Actually, you can sign up for a trial account to use Office 365 to experience the environment about SharePoint Online and SkyDrive Pro.
You can sign up for a trial account from here.
Further information about SharePoint Online, please see SharePoint Online Service Description.
Since neither of the above answers mention what you asked about - Dropbox, I'll give my 2c.
Dropbox and the original Skydrive (which is still alive and kicking) are similar in that they both offer free plans and allow file sharing in a very intuitive and simple environment. Skydrive also has web apps which allow some Office file viewing/editing.
The confusingly named "Skydrive Pro" is completely different and is actually a Sharepoint library. Sharepoint allows you to configure libraries and lists which the other services don't. You can add columns, workflows and other customizations which can be very handy in a business environment. The caveat is that with that flexibility comes a few problems:
It's far more complicated to use than the other services.
It has restrictions on file types and names which can be annoying
It has more bugs and issues which are usually very slow to get resolved if they are ever resolved
It's far slower which can get very frustrating.
For easy, fast file sharing and online editing, Google Docs is still the best choice. If you want more intricate control (and have a lot of patience) Sharepoint/Skydrive Pro is hard to beat.
How is the concern going? Feel free to post back with your further concern at your most convenience.
@Mchv2.0, thanks for your sharing.