An error occurred while saving the commentBruce commented
I agree. AutoMapping setting has caused a few problems for us as well. AutoMapped mailboxes share the same OST file as the primary email account they are associated with. Max size of the OST file is about 50GB. Once the OST reaches near the 50GB threshold, Outlook becomes unusable until someone can figure out how to reduce the OST file size.
It would make it so much easier if the Admins could see a list of all Shared Mailboxes that an account has access to, see which ones are AutoMapping, and control the AutoMapping setting!
The functionality to make it possible to change the name of an O365 tenant, especially with Sharepoint Online in mind, is being planned. There is no ETA at this time though.