In scope View and edit with the Office Web Apps. External users inherit the use rights of the Office 365 customer. Add, view, edit and delete documents, lists, list items; per their permissions. Navigate to sub-sites within the same site collection to which they were invited. View and contribute to Site Feeds. Out of scope Do not get their own Personal Sites (what used to be referred to as My Sites). They will not have their own SkyDrive Pro. External users cannot view the company-wide newsfeed or use the “following” capabilities. They also cannot edit their own profile, change their photo, or see aggregated tasks. External users do not add quota to the overall tenant storage pool. External users cannot be an administrator for a site collection. However, you can designate an external user as a designer for your Public Website. Cannot access the Search Center and will not be able to execute searches against “everything.” More details in this “What is an external user?” Office.com help article: http://office.microsoft.com/en-us/office365-sharepoint-online-enterprise-help/what-is-an-external-user-HA104036809.aspx http://office.microsoft.com/en-us/office365-sharepoint-online-enterprise-help/what-is-an-external-user-HA104036809.aspx
External user invited This creates invitation in Access Request List Invitation email sent to guest with invitation URL Guest clicks URL. Verification of validity of invitation and if external access is enabled. Guest signs in with Microsoft Account or Office 365 Account. Verification of redeemer. Guest added to SharePoint Online Directory Service & to site collection Guest gets permissions on the object & is redirected to it
User shares a document using Edit or View link Hidden user created and granted permissions on the document. Inheritance broken. Guest receives email with Guest Link. Clicks on the link. Verification: Are Guest Links enabled? Is this a valid link? Does the document exist? User impersonates the hidden user and is redirected to the document in web apps.