Why can't exchange work with VirtualBox when Windows starts?

Question

virtual box

Hello! The user has Windows 10 21h2 installed on the computer and Microsoft Exchange mail is configured. VirtualBox is also installed to work in a specific program on Windows XP. And now, when the computer is turned on, the mailer cannot connect to the Microsoft Exchange server. If you disable the VirtualBox network adapter and then enable it again, then the connection to the mail server will occur, but again, only until the computer is restarted. When removing VirtualBox, everything works fine right away when you turn it on. Tracing to mail in any case, as it should be, through the system network adapter.
Tell me, please, in which direction to dig?

Answer 1

Most likely, he just initially tries to connect through the virtualbox adapter
Google, it may be possible to make the "priority" of adapters
Well, either a simple script to deactivate / activate the virtualbox adapter

Answer 2

turning a blind eye to exchange, does the network just work? pings go? Files on the shared folders are normally read? do you have a domain controller? how is the network configured? how is the bridge?
if there is no domain, then the network is ancient like windows for workgroup and in xp it is already very outdated (windows 10 has policies that enable / disable it) it is quite possible that somewhere windows 10 detects something and switches to another type of work
as a solution without problems - put winxp on your local network, especially since releasing such a machine on the Internet (yes, just on local networks to others) is already dangerous in itself, and let the program work through a proxy or carefully configured firewall rules