Hosting and "Disk Quota"

[olds]

What exactly, does "Disk Quota" mean?
I have a hosting account. I set my daughter up with a site and a disk quota of 100 MB. She has not done anything to it for over two years though the site is still up.
The other day, I get an email saying that she is at 114 MB and over quota. How can that be if she isn't using it? She hasn't even logged in in that 2 years.

 

[nickbits]

Maybe the log files need to be deleted.

 

[DaveSimmons]

If she has the mail server turned on she could have 100 MB of junk mail by now.

 

[olds]

Thanks guys.