The last time I looked, Microsoft Office did not come with Visio. Last time I was forced to use Microsoft Office, I had to get the IT department to order and install Visio (and Microsoft Project). LibreOffice can edit Visio material directly.
However, LibreOffice can also bring in (import) Dia material, which is my preferred "Visio-like" tool. I also use Xfig. LibreOffice can revise Visio material, such that I can exchange with a Visio user.
As to "Outlook", my preference has been Evolution (for a long time). For notes, I use Evolution, Zim, Xournal and Gnome notes.
I am not sure what "the inevitable reply" is. The software I use meets my needs. May not meet your needs, but then, you are not me. Are you trying to sell me on Microsoft Office? That is very likely a non-starter: Microsoft Office would need to be able to accept Dia drawings.