What update?
There have been no Feb critical updates here
Is this with the Win11 Mail app? as an IMAP mail account doesnt use any settings in its setup.
And if IMAP no data is on the local device its all on the server so you cannot lose anything other than Contact/Calander, which are in local folders marked 'This PC only' and are lost if the email account is reset.
In the mail app Settings> About shows version(s)