Hello Gabriele, the MSI will only install the latest SmarterMail updates. The EXE performs extra checks on the server that may be useful (like IIS settings, system requirements, etc.).
Which one you choose is up to you, however, using the EXE is the safer choice. For instance, if we change the .NET version the EXE will let you know and update to that version. The MSI will not do this for you so it would be a manual step.
Larry Duran
Software Developer
SmarterTools Inc.
(877) 357-6278
www.smartertools.com