rsync copy of lock file

[Diburim]

I'm using rsync to backup some windows machine to Linux.
Some of the files that backup are lock by the windows application while
rsync run. Like outlook 2000 pst file.
This file are lock for reading and can't be access using utilites like copy,
or
other outlook 2000 etc.

My question are:
- How rsync manage to read the data?
- What abut the integrity of the data, if the file is open and get updated
while rsync coping it?

Dib Urim