Google to O365 Migration Batch

Hi jls818​ 

Short Answer:

No, deleting the migration batch will not remove already migrated emails. It only stops the migration process and the associated sync/error notifications.

Why It's Safe:

Migration batches in Office 365 (Exchange Online) do not store or own the migrated emails — they only facilitate the sync process.

Once data has been transferred to the mailbox, it remains there even if the batch is deleted.

If you've confirmed:

Emails are present

No user details missing

Mailboxes are working normally

The error is non-impacting (e.g., forwarding configuration issue)

Then there's no risk in deleting the batch.

About Those Error Emails

You’re receiving those every 15 minutes because the batch is still marked as “active” or retrying. Deleting it will stop those alerts.

One Caveat:

If you were using the batch to sync new mail during the cutover phase (aka staged or hybrid migration), then deleting it will stop syncing new incoming messages from Gmail.

Since you said:

The boxes are working fine, and history migrated already with no reported data loss.

It sounds like your cutover is complete and you’re no longer syncing Gmail — in which case, you’re good to proceed.

Action Plan:

Go to Exchange Admin Center → Recipients → Migration

Select the failed batch

Click Delete

Confirm deletion