Results of Data Migration Tests Using the M365 Developer Program

The other day, I used the M365 Developer Program sandbox to migrate Gmail, Calendar, Contacts, and Rules via a migration batch in the Exchange Admin Center.

After confirming that the migration batch’s synchronization rate had reached 100%, I stopped the migration batch and reviewed the results.

When I checked the migration details screen, I found that the number of synchronized items listed there was lower than the total number of emails I had confirmed in Gmail.

If anyone knows the reason for this discrepancy between the total number of emails in Gmail and the number of synchronized items on the migration details screen, I would appreciate your guidance.