Microsoft have announced that the Groups feature in OneDrive will be abandoned this October, over a year after the ability to create groups was removed from the service. A large majority of users will find shared folders to be an adequate replacement, and due to this, all existing groups will be removed on October 16.
Since May 2014, the ability to create groups in OneDrive has been absent, however, existing groups, and their documents have been safe.
An email was sent out to those still using groups, to inform them that the service would be seeing its end in October and to prepare, it is recommended that all files are downloaded, and then can be shared again by re-uploading to OneDrive using shared folders, or transitioning to a similar service.
Microsoft have provided a guide for users of the Groups feature, explaining how to migrate all data away from the service before the date of shutdown. Strangely, on the Microsoft Office site, it is stated that Groups will be discontinued at the end of September, however Microsoft have assured Engadget that the date stated in the email is correct.