rsync ok with open files?

[Peter]

Hi gang.  I am synchronizing Windows machines (cwRsync/cygwin) with
FreeBSD server.  A batch file is used to initiate the process (shell
invoked rsync daemon).  My question is whether I need to tell my users
to close any affected applications (ex: Outlook; I am synchronizing the
outlook.pst file) during the procedure?
Peter

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