7 October 2026, 06:20 PM
I’m currently looking into a GSuite to Office 365 Migration for a small business, and before starting the actual migration, I wanted to understand what usually goes wrong. I initially thought moving from Google Workspace to Microsoft 365 would mostly involve transferring Gmail data, but there are quite a few other things to consider.
For anyone doing this for the first time, I think the best starting point is the free/manual approach. For a small number of users, you can export Gmail data, use Google Takeout where appropriate, and then import the required data into Microsoft 365. Calendars and contacts can also be exported separately and brought into the corresponding Microsoft 365 services. This can be enough if you only have a few mailboxes and a manageable amount of data.
The problems seem to appear when the amount of data increases.
Common mistakes people make
One common mistake is starting the migration without properly matching the Google Workspace users with their Microsoft 365 accounts. If the account mapping isn't planned beforehand, it can create confusion about where the migrated data should go.
Another issue is trying to move everything without checking what actually needs to be migrated. Old emails, inactive accounts, unnecessary files, and outdated data can make the migration much larger than it needs to be.
I’d also make sure attachments, calendars, contacts, and other important mailbox data are included in the migration plan instead of focusing only on emails.
Another mistake is doing the entire migration in one go without testing. A small test with a few users can reveal problems before they affect the whole organization.
Common errors during migration
Authentication and permission problems seem to be another area that can cause trouble. If the required permissions aren't configured correctly, migration jobs may fail or only partially transfer data.
Large mailboxes can also make manual migration difficult. You may end up waiting for exports and imports, dealing with incomplete transfers, or having to repeat the process.
Duplicate data is another concern if the same mailbox is imported more than once. That’s why I think keeping track of which users and data have already been migrated is important.
What I’m considering
For a very small Google Workspace to Office 365 Migration, I’d probably start with the free/manual options. There’s no reason to introduce a migration tool if you only have a handful of users and limited data.
But for a larger migration, manually exporting and importing every mailbox doesn't seem very practical. You have to deal with user mapping, multiple mailboxes, attachments, calendars, contacts, and potentially a lot of historical data.
I also tested the Kernel GSuite to Office 365 Migration trial while researching different options. It looks more suitable for larger migrations because it provides bulk migration and options for selective and incremental migration. The idea of being able to test the process before handling the complete migration is useful, especially when there are many users involved.
I’m still deciding on the final approach, though. For people who have already completed a Google Workspace to Office 365 Migration, what worked best for you?
Did you stick with the free/manual method, or switch to a migration tool once the number of users and amount of data became too large? Also, what was the biggest issue you faced during the migration?
For anyone doing this for the first time, I think the best starting point is the free/manual approach. For a small number of users, you can export Gmail data, use Google Takeout where appropriate, and then import the required data into Microsoft 365. Calendars and contacts can also be exported separately and brought into the corresponding Microsoft 365 services. This can be enough if you only have a few mailboxes and a manageable amount of data.
The problems seem to appear when the amount of data increases.
Common mistakes people make
One common mistake is starting the migration without properly matching the Google Workspace users with their Microsoft 365 accounts. If the account mapping isn't planned beforehand, it can create confusion about where the migrated data should go.
Another issue is trying to move everything without checking what actually needs to be migrated. Old emails, inactive accounts, unnecessary files, and outdated data can make the migration much larger than it needs to be.
I’d also make sure attachments, calendars, contacts, and other important mailbox data are included in the migration plan instead of focusing only on emails.
Another mistake is doing the entire migration in one go without testing. A small test with a few users can reveal problems before they affect the whole organization.
Common errors during migration
Authentication and permission problems seem to be another area that can cause trouble. If the required permissions aren't configured correctly, migration jobs may fail or only partially transfer data.
Large mailboxes can also make manual migration difficult. You may end up waiting for exports and imports, dealing with incomplete transfers, or having to repeat the process.
Duplicate data is another concern if the same mailbox is imported more than once. That’s why I think keeping track of which users and data have already been migrated is important.
What I’m considering
For a very small Google Workspace to Office 365 Migration, I’d probably start with the free/manual options. There’s no reason to introduce a migration tool if you only have a handful of users and limited data.
But for a larger migration, manually exporting and importing every mailbox doesn't seem very practical. You have to deal with user mapping, multiple mailboxes, attachments, calendars, contacts, and potentially a lot of historical data.
I also tested the Kernel GSuite to Office 365 Migration trial while researching different options. It looks more suitable for larger migrations because it provides bulk migration and options for selective and incremental migration. The idea of being able to test the process before handling the complete migration is useful, especially when there are many users involved.
I’m still deciding on the final approach, though. For people who have already completed a Google Workspace to Office 365 Migration, what worked best for you?
Did you stick with the free/manual method, or switch to a migration tool once the number of users and amount of data became too large? Also, what was the biggest issue you faced during the migration?