Software that is offered on outlook-stuff.com is under guarantee free from advertisement, spyware, malware, trojans etc. and to the time of coding known viruses, as long as you download the software from outlook-stuff.com.

Normally you can assume that add-ins are unmodified if you download them from familiar freeware and shareware servers. But there are rotten apples that recode software and offer these changed versions for download or distribute them in another way.

A connection to the world wide web is provided by the live update function. One time per day after starting Outlook® there is a scan for new updates (if the function wasn't disabled during installation or after that). If updates are available, a little bubble in the info bar (next to the clock) will inform you. With this connection no personal data will be transmitted. 

You can also manually activate the live update function: start -> Programs -> ESM tools -> LiveUpdate