ls showing deleted file, sorta

I delete a log file like:
$ rm /var/log/postmaster.log

Then do:
$ ls /var/log
lastlog  postmaster.log  setup.log  setup.log.full  sshd.log

It still shows there, so I check again using:

$ ls /var/log -l
ls: /var/log/postmaster.log: No such file or directory
total 365
-rwxrwxrwx+   1 Administ Domain A  3144744 Apr 28 09:34 lastlog
-rwxrwxrwx+   1 Administ Domain A    94443 Apr 27 15:13 setup.log
-rwxrwxrwx+   1 Administ Domain A   211575 Apr 27 15:13 setup.log.full
-rwxrwxrwx+   1 SYSTEM   Administ      141 Nov 22 11:55 sshd.log

And it's gone!  Hmmm...was it just a timing questions?

$ ls /var/log
lastlog  postmaster.log  setup.log  setup.log.full  sshd.log

Nope, still shows up when doing a wide listing but not a long listing.

Hope this helps improve the product.  This is Cygwin, Windows 2000.
Tyler