Question about web access

I currently use Outlook for Desktop to manage about 15 email accounts across different providers (Gmail, Outlook, Exchange, etc.). The issue is that they are all tied to a single desktop, limiting remote access.

I’m looking for a web-based platform where I can:
:white_check_mark: Add multiple email accounts from different providers
:white_check_mark: Access everything from anywhere
:white_check_mark: View all accounts in a single interface, like Outlook Desktop

Does this platform support this? If so, how would it work for my setup?

Thanks,
Justin