Anywhere Access - Outlook Anywhere

You may have already seen this, but the following article discusses how you can access Exchange 2007 from anywhere... It also discusses the rebranded RPC\HTTPs - Outlook Anywhere (much better name IMO)

But please also take note of the following snippet on the page which deserves more attention:

"File Share Access You can access documents and document libraries on Windows SharePoint Services and Windows file shares through Outlook Web Access. "

This means that you can access UNC file shares and documents on Sharepoint sites through Outlook Web Access, without the need of a VPN..!

You can also.... if required.... use ISA2006 to two factor auth it ;)