Exchange Hosting Working

The following figure shows the working of Exchange Hosting.

The 1&1 Exchange environment is only compatible with Windows XP with Service Pack 1 and Hotfixes installed. You cannot use Windows 2000 or NT to connect to the Exchange server using RPC over HTTP. You can, however, use POP3 or IMAP.
Source:1&1

Microsoft Exchange Hosted Services

Microsoft Exchange Hosted Services (EHS) offers online tools to help your organization protect itself from spam and malware, satisfy retention requirements for e-discovery and compliance, encrypt data to preserve confidentiality, and maintain access to e-mail during and after emergency situations.
Electronic messaging is mission critical, but remains vulnerable to a growing array of threats. Viruses, worms, [...]