Windows 10 keeps giving me pleasant surprises, e.g. this post.
The Windows 10 Version 1703 (Creators Update) has another feature that would have saved me DAYS.
Back in early 2015 I needed to migrate my Drobo from a MBR (Master Boot Record) volume to a GPT (GUID Partition Table) volume to allow me to expand the Drobo beyond 2TB,
I got this done by configuring a second Drobo to GPT and copying all the data from the MBR volume to the GPT volume. That took a couple of DAYS.
The Creators Update includes a includes a new tool, mbr2gpt, which converts an MBR volume to a GPT volume WITHOUT modifying or deleting data on the disk.
Winaero has an article with the complete instructions. It's not trivial but it's easier that what I did.