In moving my email from gmail to outlook, it would seem that I’ve ended up with multiple copies of emails. How many such emails there are and how to remove them I am still struggling to figure out. The problem seems to be that the same message ID but have different X-TUID
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$ mu find msgid:CY1PR15MB0155CB9AAD45DA010FFFC2FCF15E0@CY1PR15MB0155.namprd15.prod.outlook.com -f 'l'
/home/tbutt/.mail/outlook/Sent/cur/1522002651.16857_33.knuckles,U=36:2,S
/home/tbutt/.mail/outlook/Archive/cur/1522002326.15658_3659.knuckles,U=236990:2,S
/home/tbutt/.mail/outlook/Archive/cur/1521978114.18576_998.knuckles,U=2593:2,S
/home/tbutt/.mail/gc/Archive/cur/1522211460.25821_33.knuckles,U=34:2,S
/home/tbutt/.mail/outlook/Archive/cur/1521979684.21093_9183.knuckles,U=20859:2,S
$ diff /home/tbutt/.mail/outlook/Archive/cur/1522002326.15658_3659.knuckles,U=236990:2,S /home/tbutt/.mail/outlook/Archive/cur/1521978114.18576_998.knuckles,U=2593:2,S