I'm afraid it won't really help.
Public folders to my knowledge can only be converted ones in one go.
OAB's have to be re-generated (which you normally do in 1 go, but technically you can do this manually).
PF + OAB is more or less tied to the exchange your using (2010 does it differently then 2013 and up).
So it really normally only works with one way at a time.
Normally you leave it at the exchange 2010 untill all mailboxes have been moved (it just means newly created mailboxes need to be moved every time aswell).
Also please note that the Database restriction able to set in older WebsitePanels has been removed since websitepanel 2.0 or 2.1, in the newer versions it's using exchange balancer to select the best available database. (you can include or exclude databases from the list via command, but generally you can't split them up per organization).
Another issue i can see is that you have 1.0.2, where we only got the upgrade to WebsitePanel 2.0 (database script) while i think you need 1.1, 1.2.1 and then 2.0, --> then SolidCP (only the database upgrade script, the files don't matter).
For SQL i would always use the latest available / capable which currently is 2017.

For everything you say, may be it would be a good idea do the migration by this way

• Make a fresh installation of SolidCP in a new server and configurate it
• Create the hosting plans, users, etc for one company
• - Migrate the users of a company to Exchange 2016
• - Import the users to SolidCP

Repeat steps 2, 3 and 4 for each company By this way, I'll have two panel controls. One of them attached to Exchange 2010 with webpanel and other with Exchange 2016 with SolidCP
I don't know if I can have both enviroments run at the sometime.
In this moment I have one environment with

• Exchange 2010 in DAG with their own database space and DC
• Exchange 2016 in DAG with their own database space and DC

Could you please give me your opinion?
Regarding database, as you said, it's not possible to lynk a company to a database, so if I need to lynk a company to a database I'll have to make scripts by powershell in order to organize some mailbox. This is needed for us because of our software backup and retentions any tip?
Thank you in advanced

Regarding SQL version, searching on the net, I've found this article wrote by you
https://websitepanel-support.com/news/websitepanel-alternative-opensource/
In my case, what it would be your advice in order to do the migration to SolidCP?
I've searching on the net and I haven't found any article about how to make the migration of our WSP panel to the latest version, prior the migration to SolidCP
I see this article regarding the migration of WSP Panel
https://websitepanel-support.com/news/websitepanel-2-1-original-installer/
Is this upgrade possible?

May be, as I wrote before, may be the best solution is making a fresh installation of SolidCP in a new server pointing a new Clients OU and after that set up it for the clients, migrate the users
In this moment, we've got address book in Exchange 2010 and Exchange 2016 for one client and it works fine
Regarding public folders, we have public folders in exchange 2010 but with no data, so our idea is don't migrate the public folders to exchange 2016
What is your opinion about which procedure would be the best option?

Basically even if you setup 2 panels the issue still remains that SolidCP needs to make Public Folders, and OAB's per hosted org.
Due to those being different methods for exchange 2010 and 2016 you can only really use either exchange 2010 or exchange 2016 method not both together at the same time.
In general you would most likely stick to the 2010 method untill all exchange mailboxes are moved over, do a oab removal / re-creation for all oab's, and migrate PF's, once done you swap the panel to exchange 2016.

Due to your panel being far behind (1.0.2) i don't think there's any way for you to upgrade the database properly from 1.0.2 to WebsitePanel 2.1 (there's no direct upgrade path which means you need other versions such as 1.1 and 1.2.1, then move to 2.0 and then you can move to SolidCP). unfortunatly i don't think if there's any place that still has 1.1 and 1.2.1 SQL upgrade scripts.. we only have the 2.0 upgrade script.
So starting a new freshly build panel would most likely be a good option for you.