I've never tried this, but 2 million items in a folder is probably going to be useless 
(unusable) even if Windows lets you create that many.  I'd be breaking up the mailing 
into chunks especially until iMS 2.5 comes out.  A quick look didn't reveal an actual 
limit of files per folder on NTFS, but I did come across some copy/pastable words of 
wisdom on MSDN site:

"If you use large numbers of files in an NTFS folder (300,000 or more), disable 
short-file name generation, especially if the first six characters of the long file 
names are similar."

and

"Avoid putting a large number of files into a folder if you use programs that create, 
delete, open, or close files quickly or frequently. The better solution is to 
logically separate the files into folders so that you can distribute the workload on 
multiple folders at a time. 

If there is no way to logically separate the files into folders, put all the files 
into one folder, and then disable 8.3 file name generation. "


Also if you're really sending a million mails I would recommend creating the mail 
files on one machine and then moving them over into the iMS POST queue on a different 
machine (or generate all the mails first before any sending).  


Cheers,
-Max

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