My question is how to move/relocate the Apple Mail data folder/files from my home folder on my system HD to a separate drive that I use exclusively for data. In this case, I do not plan to copy or migrate any mail from Outlook to Apple Mail, so my use of Apple Mail will be 'clean' in the sense there will be no prior emails or accounts in Apple Mail.

Move Apple Mail to separate drive I am considering changing from Outlook to Apple Mail as my mail client.

I know that even if this works, I'm still going to have to import all my Outlook 2011 messages into Outlook 365 because MS also failed to provide an automatic way for 365 to pick up existing Outlook data.

I've done some research so far and haven't found any definitive answer. Will something similar work for Outlook 365 (aka Outlook 2016)? In other words, if I put a symbolic link to a folder named /Outlook 15 Profiles on my data HD at ~ /Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles on my system HD will I effect the same situation I had with Outlook 2011? In the past, with Outlook 2011, the default Outlook data location was ~ /Documents/Microsoft User Data and by using a symbolic link at that location I was able to store all my Outlook data on my data HD. In the process I discovered that Microsoft changed the Outlook Identities to Profiles and, worse, changed the location of Outlook's data folders from ~ /Documents/Microsoft User Data to ~ /Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles - which is of, course, on my Mac system HD. I just upgraded from Office 2011 to Office 365.

Mac outlook identity vs profile