Zimbra Forums

Hi,

Has anyone done any migration recently from Exchange to Zimbra using the Migration Tool?

We are trying to migrate a customer of us from Exchange and the Zimbra migration tool is very slow. I mean, it's taking about 40 minutes to migrate an account with just 300mb and 6000 items.

We couldn't find any bottleneck. CPU, RAM, I/O, and NETWORK performance/sizing are OK.

Hi,

Just to report if anyone faces the same issue: The bottleneck was the Exchange throttling policy that is enabled by default.

We were able to increase a lot the performance by disabling it for the admin user used for the migration:

https://help.bittitan.com/hc/en-us/arti ... -Exchange-

https://docs.microsoft.com/en-us/previo ... =exchg.80)