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Google's apps are strictly browser-based; if you want offline editing, you need to use Chrome and make some configuration changes.
Docs don't offer the same full range of features as Microsoft Office programs and work best in an all-Google environment. Importing and exporting files to Office formats can result in missing or damaged formatting.
For collaborative projects having access to previous versions lets you roll back unwanted edits quickly.
Neither Dropbox nor SkyDrive can boast this unique feature of Google Docs. When you create a form, you can define fill-in-the-blanks fields, checkboxes, and options, and then publish the result as a survey, using a link or email.