Do NOT transfer my account to Office 365.
(Ignore my comments in 213335 as I believed IMAP would remain available in Office 365 until October 2020 )
I have just been told that IMAP on Office365 has already been disabled, counter to the guidance on your website, which said from "October" (which year?)
https://www.staffnet.manchester.ac.uk/modernising-it/technology/office365/resources/
As a Linux user I do not have Outlook, and with 6000 monthly emails I rely heavily on filtering and local search using offlineimap and notmuch.