Are there limits to the number of PST files in Outlook 2013?

Does anyone know if there are limits to the number of pst files a user can have in Outlook 2013?  We have a user who treats pst files like folders in the inbox despite us telling them that they shouldn't do that and now they are having performance issues on Outlook.  There are over 90 of them.  So I was wondering if there are actual limits to the number of files.  Size is acceptable, most being fairly small.  Biggest I think is 5GB.
William BeattySystems AdministratorAsked:
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JohnBusiness Consultant (Owner)Commented:
I do not think there is any limit (although 90 is high and the user is severely mismanaging Outlook). I have multiple PST files for main and archives.
pgm554Commented:
The problem is not so much the limits on the numbers of pst files ,but the time that it takes to open and close each one as they are basically db files that require CPU cycles and disk i/o to do so.

If you wanted to speed things up ,move all the pst files over to a SSD and that may eliminate some of the issues that are occurring.
RAM  may also be needed as a certian amount of caching is done for the programs involved.

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N8iveITCommented:
Not aware of anything but size limitations which vary on versions.

However, one additional note, if he searches through *all* mail on a regular basis, he could really see a slowdown due to PGM554's info above. I'm fuzzy on why he would even do this. Does he complain of speed issues with email?

Reminds me of something I saw several years ago. I supported a user who used his Outlook Deleted Items as a filing cabinet, complete with folders he created for storing deleted email and everything.
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pgm554Commented:
A pst file is indexed and cached in OL on a regular basis.
Not sure about your point about a slowdown.
I have users with 30 or 40 gig pst files that once they moved to SSD wold mount in a matter of a minute or two as opposed to 5 or 10.

As for the deleted folders thing ,I've seen a couple of folks do this and went WTF?
Shaun VermaakTechnical SpecialistCommented:
Christ HaroldSoftware EngineerCommented:
Dear Author,

Theoretically, there is no bar on the number of Outlook PST files, one can create an infinite number of PST file. But the number of PST files is not concerned, it is the size of PST file that's matter in Outlook.

This question is a good example of the illusion.


Happy to Help !!!! Cheers

Thanks & Regards
Christ Harold
Software Engineer
William BeattySystems AdministratorAuthor Commented:
Yeah I could find nothing on limits on the number of PST files, hence the question.  I'm suspecting that the user's performance issue is due to the sheer quantity of them as I can find no other reason right now.  I don't know why they insist on using them in this way instead of creating folders like you are supposed to.  It bears some further investigation on my part but I'm satisfied as to there being no actual limit to the number of files.  I was hoping for something to use as a hammer to get the user to stop using PST files in this way.  Oh well.  The slowdowns may be due to a mix of size and quantity.

And I too have had users use deleted items as some sort of storage area before too.  It boggles the mind :)

Thanks for the assistance on this.
N8iveITCommented:
Could the "hammers" be ... (1) backing up archived emails is much better in Exchange (rather than distributed among PST files), not to mention (2) MORE secure (in this age of issues)?
William BeattySystems AdministratorAuthor Commented:
I've tried those arguments before and it didn't work unfortunately.
William BeattySystems AdministratorAuthor Commented:
The problem has more to do with overall performance of too many PST files so getting users to do with less files would be helpful
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