Possible Duplicate:
When should we allow questions about products that don't belong to a SharePoint SKU?
Since there are different products involved (Exchange, SharePoint, Lync, Office Clients) I am wondering where questions about Office 365 should be asked?
SharePoint Online would definately be on-topic. Other products like Lync and Exchange I would deem off-topic. There are grey areas though, since parts of the federation model etc are clearly on-topic for SharePoint.
If it's about the SharePoint platform then it's on topic.
As @Anders says, there will be grey areas. We'll need to deal with them on a case-by-case basis.
