Whenever any organization or business owner thinks about an appropriate cloud platform, then their search ends at Microsoft Office 365. It has already become a foremost player in the cloud business all over the world and a number of businesses are transferring their data at a swift pace. However, at the time of migration the Office data, you might consider taking several precautions. Otherwise, there can be quite a few consequences in the form of unwanted errors. One such error in Office 365 is unauthorized error 401. According to the experts of Microsoft Office 365 Support, this particular error does not even let the migration process started. So, in order to fix this error, make a call at toll-free number as soon as possible.