Based on our record, Cloudiway seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I used https://cloudiway.com/ for about 40 users for gmail and good drive migrations and it allows iterative migration by user etc. Source: over 2 years ago
imapsync - Console-based utility for migrating IMAP mailboxes.
OfflineIMAP - OfflineImap synchronizes email between an IMAP server and a MailDir or between two IMAP servers.
isync (mbsync) - mbsync is a command line application which synchronizes mailboxes.
Fetchmail - The Fetchmail Project
MigrationWiz - MigrationWiz provides on-demand mailbox migration services through a fully automated cloud-based...
IMAPSize - IMAPSize