Michele wrote:

Hi,
from the moment I started using Outlook I have used the Calendar to
store my personal activities (i.e. "backup", a reminder which repeats
monthly).

Me too.

However, I read that tasks are more suitable for personal activities.

And these sources say that without argue the reasons? Then you should
not hear to these sources.

What's the difference between tasks and reminders/meetings?

Try it and look to the differences of the form and features.

I guess one importand difference between calendar and tasks is that
the outlook-tasks are good to assign tasks to someone else because you
will get feedback automatically if someone else finishs a task. But I
do not use this feature and ...

How do you use them?

.... so i don't use tasks but many calendar entries like you.