<Filename> is being modified by <Username>. Do you want to open it

Hi Guys,

Not sure if anyone has found this with Vista yet, but hopefully you have and
there is an answer

Environment:
- Issues is happening on New Sony Vaio Laptop (Top Specs 2Ghz , 2Gb RAM etc)
Visa Business. Using Offline Files (All updates)
- Symantec Antivirus 10.2 on the laptop
- Office Pro 2003 (All updates)
- Network is a SBS 2003 R2
- 10 Other Windows XP Laptops on the network and none on these have this
error.


Problem:
When attempting to open (generally PowerPoint files, but does happen with
other Office documents), you get the error "<Filename> is being modified by
<Username>. Do you want to open it as read-only?". The strange thing is that
it does not always happen. You can close that document, Reopen it, and
generally it will happen right way or within two or three attempts. Of course
this is the same not just with opening the same document, by say if you have
one PowerPoint files open, close that and then open other PowerPoint file,
you get the error.
- I should also mention that this happened both in Offline mode and when
connected to the network (within the same file structure)

What has been attempted:
- Resetting the Offline File Cache
- Re-installation of the Laptop with Generic Software (as specs above)
- Checked Security settings on the folder and files

Comments:
It does kinda sound like another use is access that file, but there is not.
I have also made a test folder with bogus data, and can re-produce the same
error, thus proving that it's not that users folder or files. It defiantly is
a Vista issue, as the other workstations are running the same software
(except of Vista that is, and XP Pro instead).
No should of sending the laptop back to Sony and get our money back, which
is another issue in itself, l am a little stumped.
I should also point out that l have ran the SBS2003 Visa patch but the
issues seems still to be there.

Any ideas? And thanks for the replies.