Docs: 200 total BUT only 10 simultaneous editors + Spreadsheet: Unlimited total BUT only 50 simultaneous editors
Unlimited
1 to 3
Unlimited
Unlimited
Storage
5000 docs, and 1000 spreadsheets per user.
Unlimited
2GB
Unlimited
2GB
Content Access Control
Yes, only individuals that have been invited to collaborate can do so
No
Yes, access to content can be controlled at the Folder Level / Page Level
Yes, access to content can be controlled at the Folder Level / Page Level
No
Revision Comparison
No
Yes
Yes
Yes, Side by Side comparison is a unique feature
Yes
Revision Notification
Email
RSS and Email
RSS and Email
RSS and Email
RSS
File Upload
Docs, Presentations, Spreadsheets. File sizes vary depending on file type.
Any media / documents type + Capable of multiple simultaneous uploads + No file size limit.
Any media / documents type + Capable of multiple simultaneous uploads + No file size limit.
Any media / documents type + Capable of multiple simultaneous uploads + No file size limit.
Any media / documents type + No multiple simultaneous uploads + No file size limit.
Tech Support
No, but there is an extensive FAQs section
No, but there is an active community present to answer questions
Yes, phone and email
Yes, phone and email
Yes, email only at the free service level
Unique Characteristics
Combines with other Google services: mail, address book, calendar + Possibility to use the suite offline
Not hosted + Extensive Extensions (addons) library + Multilingual capability for UI
Academic discounts + Built in Analytics (not at free level) + Built in Search (not at free level)
Only 14 Day Trial at Free Service Level + Socialtext Signals (a Twitter-like microblogging service) + Personalized Start Page (think iGoogle) + Individual Wiki pages can be combined to create a compound page + Mobile friendly