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Difference in size of Mailboxes after migration

Posted: Mon May 20, 2019 10:21 am
by elderf
Hello greetings to all ...

Two weeks ago we executed a migration from gmail apps to zimbra of 200 mailboxes ...

The mailboxes in gmail had a maximum size of 30GB (only emails did not migrate shared documents) when passing them to zimbra in some cases they duplicated but never coincided the 30GB of gmail with the new mailbox in zimbra ..

We execute the migration with Imapsync ..

Does anyone know for what reason this happens?

Re: Difference in size of Mailboxes after migration

Posted: Tue May 21, 2019 7:52 am
by gabrieles
It's related to the lable concept. Gmail does not works with folders and subfolder but with label.
When it comes to "translate" that in an IMAP tree structure, Gmail maps every label to a folder.
If you have a message that has two labels A and B, you will have two folders A and B each one with a copy of the message.
I had once a similar problem with a customer that used and abused the gmail labels: each message had from 3 to 12 labels. Results: a 1GB account became a 12 GB account on Zimbra (with all the right rage of the customer that expected and paid for a 1GB..).
Solution, if you use imapsync for migration, use --gmail1