Hi Dan,
Since you mentioned that your friend was using it. There would be problem
with loking in master document.
Master documents: Lock or unlock a subdocument
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A subdocument in a master document (master document: A "container" for a
set of separate files (or subdocuments). You can use a master document to
set up and manage a multipart document, such as a book with several
chapters.) may be locked when somone else is working on it, or it may be
set to open as read-only.
On the View menu, click Outline.
If the subdocuments are collapsed, on the Outlining toolbar (toolbar: A bar
with buttons and options that you use to carry out commands. To display a
toolbar, click Customize on the Tools menu, and then click the Toolbars
tab.), click Expand Subdocuments .
Click anywhere in the subdocument that you want to lock or unlock.
On the Outlining toolbar, click Lock Document .
Notes
Microsoft Word locks subdocuments when any of the following cases is true:
The subdocuments are collapsed.
The master document is shared by a workgroup, and someone else is currently
working on the subdocument.
Someone who previously worked on the subdocument set file sharing to the
read-only (read-only: A setting that allows a file to be read or copied,
but not changed or saved. If you change a read-only file, you can save your
changes only if you give the document a new name.) option.
The subdocument is stored on a read-only file share.
Thank You...
Raghu...
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