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There is now a CONTENT FREEZE for Mercury while we switch to a new platform. It began on Friday, March 10 at 6pm and will end on Wednesday, March 15 at noon. No new content can be created during this time, but all material in the system as of the beginning of the freeze will be migrated to the new platform, including users and groups. Functionally the new site is identical to the old one. webteam@gatech.edu
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Atlanta, GA | Posted: September 7, 2016
We [Microsoft] are updating how SharePoint Online and OneDrive for Business send external sharing invitations. You’ll begin seeing this change September 2, 2016, with rollout completion expected by the end of the month.
Previously, we sent external sharing invitations via the Microsoft Online Services Team address. We have often heard that this e-mail address is confusing and that users have trouble finding invitations that have been sent to them. To address these issues (and to make our external sharing mails consistent with our internal sharing mails), we will now be sending external sharing invitations via the Exchange Web Services. Sharing invitations will now come from a SharePoint owned "No Reply" address.
No changes are required at this time. External users will continue to receive invitations with no change in the acceptance flow.