This is going to be a bit cumbersome for those using Thunderbird or Mail.app (on Mac) or Outlook (Mac) over (plain) IMAP — the document instructs users to remo

This is going to be a bit cumbersome for those using Thunderbird or Mail.app (on Mac) or Outlook (Mac) over (plain) IMAP — the document instructs users to remove and re-add these accounts. That would mean (in my understanding, at least of Thunderbird) re-downloading all mails and folders once again into the newly setup account in the client. Those who use only a single device are probably going to have to schedule this appropriately to avoid having no visibility into mails for sometime.