What happens if you convert a 100GB E3 mailbox to 2GB F1 mailbox?

Steel Contributor

What happens if you convert a 100GB E3 mailbox to 2GB F1 mailbox?

 

what is the best practice in downsizing 100GB E3 mailbox to 2GB F1 mailbox?

2 Replies
Wow,
I think you will be at risk and you can end damaging the Mailbox

I agree with Juan! 

 

In fact, it may not work at all and you'll have to reduce the mailbox size to under 2GB beforehand. I'm getting this from here, though it's not an exact match:

 

Mailbox.png

 

Here is Microsoft's advice to "Back up data before switching O365 for business plans" including how to back up the data accordingly.