If Microsoft had proper backups it would not take more than a week to recover them. T-Mobile's original statement was probably made at the point where Microsoft

If Microsoft had proper backups it would not take more than a week to recover them. T-Mobile's original statement was probably made at the point where Microsoft admitted they had no backups and perhaps T-Mobile jumped the gun a bit saying there was no chance of data recovery. Presumably they were not too happy with Microsoft and welcomed the bad PR the original statement would bring.