exchange 2010 item count

I read online that Exchange 2010 item count recommended size is 100000.

Is that 100000 items per folder in the mailbox? Or 100000 items for the entire mailbox? What is item count?  Is that how many emails you have in the mail box?
IT_FanaticAsked:
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imkotteesSenior Messaging EngineerCommented:
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Aditya AroraNetwork & Hardware Commented:
Hi,

Actually what i find somewhere is the size of .pst ot .ost matters not the item count. in Outlook 2013/2010 its 20 GB.

Aditya
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Aditya AroraNetwork & Hardware Commented:
you can refer below Microsoft doc for file size.

http://support.microsoft.com/kb/982577
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Aditya AroraNetwork & Hardware Commented:
it actually will be Max 100000 item per folder and .pst and .ost will not more then 20 GB for better performance.
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IT_FanaticAuthor Commented:
Ok when I run this script on power shell

Get-MailboxStatistics -Server "SERVER" | ft DisplayName, TotalItemSize, ItemCount

The results I get for the user are

TotalItemSize                                                         ItemCount
17.33 GB (18,609,319,269 bytes)                         128663

The question now is if 100000 is the max items per folder. Does that mean he hasn't even come close to this number because he has a lot of folders and sub-folder within folder under his inbox? You can see that on the attachment.

Or is it 100000 items on the inbox?

Should we be concerned about this user? How much has he truly gone over the cap and how at risk would you say this mailbox is? and when should someone actually worry about a user like this concerning size and items?
Folder-and-Subfolders.JPG
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Aditya AroraNetwork & Hardware Commented:
You dont need to worry for item but for size as in your case its already 17 Gb plus.
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IT_FanaticAuthor Commented:
It's amazing how there are so many different opinions regarding outlook and exchange.  either the itemcount it to big or its ok or doesn't matter. or the mailbox is too big or its fine as long as you have space on the server. It's like there no ser in stone definitive answer when it comes to this topic
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IT_FanaticAuthor Commented:
Thanks for the info. It looks like we are just going to move them to Office365
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