Hello all,

I'm using office 365 2013 (I think). I'm making an awesome file with some macro's, thus saved as an xlsm file.
Now I am wondering if that will open on all (previous) versions of excel.

I noticed some older versions of excel running here, my guess would be 2003, but I'm not sure.
Since I cannot test it this week, since the person in question is not here, I'm not able to test it myself.

Another question related to this, what is the best way to set security level?
I know I can trust my own program, but it's just for one other (max 2 other) persons to make something slightly more easy.

Thanks in advance.