If you'd like to play along, the batch file below demonstrates the problem.  
Note that we're creating two files, copying them to a new folder, but only one 
ends up at the end.  I really need to be able to use robocopy to do this copy 
to minimize the disruption to the users, but this is really jamming me up.

-----------------snip-----------------
md CollisionTest
cd CollisionTest
echo a > xxxxxx~1.xxx
echo a > xxxxxxxxxx.xxx
md new
copy /y *.* new
dir new
-----------------snip-----------------

-----Original Message-----
From: Crawford, Scott [mailto:crawfo...@evangel.edu] 
Sent: Friday, July 29, 2011 3:41 PM
To: NT System Admin Issues
Subject: RE: Weird robocopy /mir bug?

Turns out that this issue was a known issue that was fixed in W2K SP3 and NT 
SP5.  Unfortunately it seems to be back.  Maybe I should spin up a W2K box to 
do this copy :) Anybody have any better options?

http://support.microsoft.com/kb/195144


-----Original Message-----
From: Crawford, Scott [mailto:crawfo...@evangel.edu]
Sent: Thursday, July 28, 2011 7:33 PM
To: NT System Admin Issues
Subject: RE: Weird robocopy /mir bug?

You mean short name generation on the server?  That's on my list of 
"desperation" ideas, mainly cuz I've never done it so I'm not sure exactly what 
the effects will be. Does that delete all existing short names?

-----Original Message-----
From: Kurt Buff [mailto:kurt.b...@gmail.com]
Sent: Thursday, July 28, 2011 6:42 PM
To: NT System Admin Issues
Subject: Re: Weird robocopy /mir bug?

Turn off short filenames?

On Thu, Jul 28, 2011 at 15:51, Crawford, Scott <crawfo...@evangel.edu> wrote:
> I’m having some strange problem where robocopy /mir doesn’t actually, 
> well…mirror.  I’m pretty sure it has something to do with short file names.
> The files that are causing problems are named:
>
>
>
> Short name   Long name
>
> OLIVER~1.WPD OLIVER-M.GD2.wpd
>
>              OLIVER-M.GRD
>
> OLIVER~3.WPD oliver-m.rec.wpd
>
>              OLIVER~2.WPD
>
>
>
> Due to the nature of the problem, I’m not sure which files are 
> actually causing the problem, but I believe it’s the last two listed.
> It seems like there’s a name collision on OLIVER~2.WPD.
>
>
>
> I’ve posted the log below and also at www.evangel.edu/robocopy.txt for 
> better readability. I’ve run robocopy /mir 4 times so you can see how 
> it goes back and forth replacing existing files with new ones.
>
>
>
> I can’t for the life of me figure out what’s going on or more 
> importantly how to fix it. Any help is appreciated.
>
>
>
> E:\Staff\NelsonN\My Documents\WPDocs\profcorr\Rec\Letters>dir "Floppy 
> Disk 1\oli*.*" /x
>
> Volume in drive E is New Volume
>
> Volume Serial Number is B0B3-6FF9
>
>
>
> Directory of E:\Staff\NelsonN\My
> Documents\WPDocs\profcorr\Rec\Letters\Floppy Disk 1
>
>
>
> 12/25/1999  06:36 PM            13,121 OLIVER~1.WPD OLIVER-M.GD2.wpd
>
> 03/15/1999  01:20 AM            12,684              OLIVER-M.GRD
>
> 03/15/1999  05:50 PM             8,803 OLIVER~3.WPD oliver-m.rec.wpd
>
> 12/25/1999  06:29 PM            10,367              OLIVER~2.WPD
>
>                4 File(s)         44,975 bytes
>
>                0 Dir(s)  61,758,398,464 bytes free
>
>
>
> E:\Staff\NelsonN\My Documents\WPDocs\profcorr\Rec\Letters>n:
>
>
>
> N:\Staff\NelsonN\My Documents\WPDocs\profcorr\Rec\Letters>e:
>
>
>
> E:\Staff\NelsonN\My Documents\WPDocs\profcorr\Rec\Letters>robocopy
> "Floppy Disk 1" "n:Floppy Disk 1" /mir
>
>
>
> ----------------------------------------------------------------------
> ---------
>
>    ROBOCOPY     ::     Robust File Copy for Windows
>
> ----------------------------------------------------------------------
> ---------
>
>
>
>   Started : Thu Jul 28 12:03:13 2011
>
>
>
>    Source : E:\Staff\NelsonN\My
> Documents\WPDocs\profcorr\Rec\Letters\Floppy
> Disk 1\
>
>      Dest : N:\Staff\NelsonN\My
> Documents\WPDocs\profcorr\Rec\Letters\Floppy
> Disk 1\
>
>
>
>     Files : *.*
>
>
>
>   Options : *.* /S /E /COPY:DAT /PURGE /MIR /R:1000000 /W:30
>
>
>
> ----------------------------------------------------------------------
> --------
>
>
>
>                           91    E:\Staff\NelsonN\My 
> Documents\WPDocs\profcorr\Rec\Letters\Floppy Disk 1\
>
> 100%        New File               10367        OLIVER~2.WPD
>
>
>
> ----------------------------------------------------------------------
> --------
>
>
>
>                Total    Copied   Skipped  Mismatch    FAILED    Extras
>
>     Dirs :         1         0         1         0         0         0
>
>    Files :        91         1        90         0         0         0
>
>    Bytes :    1.01 m    10.1 k    1.00 m         0         0         0
>
>    Times :   0:00:00   0:00:00                       0:00:00   0:00:00
>
>
>
>    Ended : Thu Jul 28 12:03:13 2011
>
>
>
> E:\Staff\NelsonN\My Documents\WPDocs\profcorr\Rec\Letters>robocopy
> "Floppy Disk 1" "n:Floppy Disk 1" /mir
>
>
>
> ----------------------------------------------------------------------
> ---------
>
>    ROBOCOPY     ::     Robust File Copy for Windows
>
> ----------------------------------------------------------------------
> ---------
>
>
>
>   Started : Thu Jul 28 12:03:15 2011
>
>
>
>    Source : E:\Staff\NelsonN\My
> Documents\WPDocs\profcorr\Rec\Letters\Floppy
> Disk 1\
>
>      Dest : N:\Staff\NelsonN\My
> Documents\WPDocs\profcorr\Rec\Letters\Floppy
> Disk 1\
>
>
>
>     Files : *.*
>
>
>
>   Options : *.* /S /E /COPY:DAT /PURGE /MIR /R:1000000 /W:30
>
>
>
> ----------------------------------------------------------------------
> --------
>
>
>
>                           91    E:\Staff\NelsonN\My 
> Documents\WPDocs\profcorr\Rec\Letters\Floppy Disk 1\
>
> 100%        New File               10367        OLIVER~2.WPD
>
> 100%        Older                   8803        oliver-m.rec.wpd
>
>
>
> ----------------------------------------------------------------------
> --------
>
>
>
>                Total    Copied   Skipped  Mismatch    FAILED    Extras
>
>     Dirs :         1         0         1         0         0         0
>
>    Files :        91         2        89         0         0         0
>
>    Bytes :    1.01 m    18.7 k  1016.1 k         0         0         0
>
>    Times :   0:00:00   0:00:00                       0:00:00   0:00:00
>
>
>
>    Ended : Thu Jul 28 12:03:15 2011
>
>
>
> E:\Staff\NelsonN\My Documents\WPDocs\profcorr\Rec\Letters>robocopy
> "Floppy Disk 1" "n:Floppy Disk 1" /mir
>
>
>
> ----------------------------------------------------------------------
> ---------
>
>    ROBOCOPY     ::     Robust File Copy for Windows
>
> ----------------------------------------------------------------------
> ---------
>
>
>
>   Started : Thu Jul 28 12:03:16 2011
>
>
>
>    Source : E:\Staff\NelsonN\My
> Documents\WPDocs\profcorr\Rec\Letters\Floppy
> Disk 1\
>
>      Dest : N:\Staff\NelsonN\My
> Documents\WPDocs\profcorr\Rec\Letters\Floppy
> Disk 1\
>
>
>
>     Files : *.*
>
>
>
>   Options : *.* /S /E /COPY:DAT /PURGE /MIR /R:1000000 /W:30
>
>
>
> ----------------------------------------------------------------------
> --------
>
>
>
>                           91    E:\Staff\NelsonN\My 
> Documents\WPDocs\profcorr\Rec\Letters\Floppy Disk 1\
>
> 100%        New File               10367        OLIVER~2.WPD
>
>
>
> ----------------------------------------------------------------------
> --------
>
>
>
>                Total    Copied   Skipped  Mismatch    FAILED    Extras
>
>     Dirs :         1         0         1         0         0         0
>
>    Files :        91         1        90         0         0         0
>
>    Bytes :    1.01 m    10.1 k    1.00 m         0         0         0
>
>    Times :   0:00:00   0:00:00                       0:00:00   0:00:00
>
>
>
>    Ended : Thu Jul 28 12:03:16 2011
>
>
>
> E:\Staff\NelsonN\My Documents\WPDocs\profcorr\Rec\Letters>robocopy
> "Floppy Disk 1" "n:Floppy Disk 1" /mir
>
>
>
> ----------------------------------------------------------------------
> ---------
>
>    ROBOCOPY     ::     Robust File Copy for Windows
>
> ----------------------------------------------------------------------
> ---------
>
>
>
>   Started : Thu Jul 28 12:03:17 2011
>
>
>
>    Source : E:\Staff\NelsonN\My
> Documents\WPDocs\profcorr\Rec\Letters\Floppy
> Disk 1\
>
>      Dest : N:\Staff\NelsonN\My
> Documents\WPDocs\profcorr\Rec\Letters\Floppy
> Disk 1\
>
>
>
>     Files : *.*
>
>
>
>   Options : *.* /S /E /COPY:DAT /PURGE /MIR /R:1000000 /W:30
>
>
>
> ----------------------------------------------------------------------
> --------
>
>
>
>                           91    E:\Staff\NelsonN\My 
> Documents\WPDocs\profcorr\Rec\Letters\Floppy Disk 1\
>
> 100%        New File               10367        OLIVER~2.WPD
>
> 100%        Older                   8803        oliver-m.rec.wpd
>
>
>
> ----------------------------------------------------------------------
> --------
>
>
>
>                Total    Copied   Skipped  Mismatch    FAILED    Extras
>
>     Dirs :         1         0         1         0         0         0
>
>    Files :        91         2        89         0         0         0
>
>    Bytes :    1.01 m    18.7 k  1016.1 k         0         0         0
>
>    Times :   0:00:00   0:00:00                       0:00:00   0:00:00
>
>
>
>    Ended : Thu Jul 28 12:03:17 2011
>
>
>
> ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ 
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>
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