I would imagine the level of protection would be reduced, since (I think, I could be wrong) the mail scanner checks your mail before it’s downloaded. Have you tried running the mail configuration wizard again? I’ve had to that before on some copies (of Avast.)
I removed the "internet email" and "outlook" because it did not work, do not scan anything.
The Outlook/Exchange you don’t need unless you have MS Outlook (not exchange) installed. The Internet Mail provider is for other POP3/SMTP email programs.
What email program do you use ?
Why doesn’t it work, what errors are displayed, etc. ?
At the moment for optimal protection you need these 3 providers:
Standard Shield
Network Shield
Web Shield
These 3 are essential. Others are nice to have but not really necessary. POP3 scanning is hardly used these days as lots of users just use web based e-mail clients like Yahoo, GMail or Hotmail. But if you do use it it doesn’t hurt to have it there i guess from the point of its mail heuristics integrated in it. P2P and IM shields are useful if you also want scanning inside archives, otherwise everything you download will be scanned by Standard Shield when you extract the packages (usually ZIP or RAR archives).
MS Outlook provider is limited to MS Outlook.
If you’re aiming for minimal number of providers, use those 3 and you should be fine.