Outlook 2007 Suddenly hard to see fonts??

This may sound like the ultimate goofy question, but I really need advice.
I am running Outlook 2007 on Vista. No problems at all until tonight. Now I can't tell if I have simply done something without knowing it by using the Logitech cordless mouse (MX7) or if it is something I did when I pasted a picture into the email I sent.
Now the font is so terribly small and hard to see, unless I set it for about size 40 or something else equally wild.

Any thoughts on this? I am stumped.

 

OK Mystery solved.
I confess. Don't know how all the functions work on this mouse. Looks like I had it somehow so everything looked smaller.