I take it your laptop is not issued by your workplace and is not part of the
domain?
If this is the case, you would have to ask your system administrator whether
or not they would allow it.
Likely they will not since
1) It's not company issued and they have no way of controlling what you
install/uninstall/do that might conflict or impair the function of Outlook.
or
2) The security of the laptop can't be guaranteed and since there would be
company information contained in email, if the laptop was compromised or
stolen there would be a major liability issue since it's a personal laptop.
or
3) The only method they allow is VPN because they would of course have the
network fully-protected which would require special software and likely the
standard is only to install that on company-issued laptops. That way they
have more control.
In any case, you would have to discuss this with them.