Absolutely massive ++1 for Imapsync. A few years ago I automated the migration of our student mailboxes from Google to M365. It worked perfectly, we estimated it could take up to 3 weeks but I ended up running about 112 parallel migrations simultaneously and in the end it took a shade under 72 hours.
99.9% or more of the messages moved successfully, some had to be ignored because the Exchange system wouldn't accept them for reasons which we could sometimes work out and around, but not for others. It's a brilliant tool. I expect to be using it again when the demands arrive to move away from MS because they want to bleed my employer to death with licensing costs. Graeme
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