Today Microsoft has a terrific product on the market called Office Groove.
It is based on a digital identity and a set of security rules and mecanisms that can provide, today, end-to-end user security either for the Enterprise and SMBs. It is even cross-firewall and works intelligently with Microsoft Outlook and SharePoint.
Moreover
data is not centralized and can not be indexed easily without explicit user's consent (authorization).
Microsoft Office Groove is also perfectly suited for "Social Computing for Business" if we consider that Microsoft Office is a long term on everybody's desktop...
Furthemore, Live Mesh, which does not have a clear business model yet, can be considered as "an entry level and consumer approach", which complements very well Groove as it extends it to some extend "non Windows devices"
Just have a look and d
ownload a free trial version of Microsoft Office Groove 2007 from here
http://r.office.microsoft.com/r/rlidGrooveC108?clid=en-us or see the application integration potential on http://www.grooveit.biz .