My personal emails were hosted by OVH in their Exchange services since 2003 and this service didn't really evolve that much for the price I have to pay every month.
So I decided to move from OVH to Office 365 and this has been my first time so I documented it, it can maybe be useful for someone.
You need to have the Office 365 admin website : https://aka.ms/admincenter
you also need to have your OVH manager webpage opened : https://www.ovh.com/manager
First in the Office 365 admincenter page, go to Settings / Domains and click Add Domain
![](https://www.archy.net/content/images/2023/10/image-7.png)
Add you domain in the form domain.com
![](https://www.archy.net/content/images/2023/10/image-8.png)
Then follow the process and chose the option suitable your usage.
![](https://www.archy.net/content/images/2023/10/image-9.png)
![](https://www.archy.net/content/images/2023/10/image-38.png)
In the OVH manager, create the TXT entry as requested on the Office 65 admincenter
![](https://www.archy.net/content/images/2023/10/image-10.png)
Chose TXT field
![](https://www.archy.net/content/images/2023/10/image-11.png)
Enter the values you got in the Office 365 admincenter
![](https://www.archy.net/content/images/2023/10/image-39.png)
![](https://www.archy.net/content/images/2023/10/image-13.png)
Once it's done go back to the Office 365 admincenter and click on more option
![](https://www.archy.net/content/images/2023/10/image-14.png)
I chose the second option because I wanted to check it worked, and it did !
![](https://www.archy.net/content/images/2023/10/image-15.png)
I didn't need the Skype for Business and Device Management as I just need the email services
![](https://www.archy.net/content/images/2023/10/image-16.png)
I chose to import the DNS entries from OVH
![](https://www.archy.net/content/images/2023/10/image-17.png)
Next these are the DNS informations needed to be changed in OVH
![](https://www.archy.net/content/images/2023/10/image-18.png)
I had to modify in text mode
![](https://www.archy.net/content/images/2023/10/image-25.png)
![](https://www.archy.net/content/images/2023/10/image-26.png)
![](https://www.archy.net/content/images/2023/10/image-40.png)
and change the DNS servers by the Microsoft ones
![](https://www.archy.net/content/images/2023/10/image-27.png)
As I had DNS Sec enable, I have this error that stopped me to continue, once disabled I had to wait 6 hours before being able to move on and finish the process.
![](https://www.archy.net/content/images/2023/10/image-28.png)
![](https://www.archy.net/content/images/2023/10/image-37.png)
Here you go. Now you just need to create a new user with the right UPN to enable the mailbox.