outlook 2010 client with exchange 2010 mailbox server

Hi,
I'm looking for KB article for outlook 2010 client what is the limitation of folders creation that is running online mode not cache mode ?

I have few user that have over 3000 folders creation and would like to know if that have exceeded the limit support.

I'm aware each folder , the items should not exceeded over 100,000 items

 in outlook 2016 have that improve limitation of folders and per items per folder ?
Jimmy WangAsked:
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S_K_SCommented:
Is your question related to O365 or a specific version of Exchange with combination of Outlook 2016

Below is what I read to be the limit for different versions of Outlook 2016, Outlook 2013 and Outlook 2010:
100,000 items per folder
500 folders total
Outlook 2007:
50,000 items per folder
500 folders total

You may also review the below article if you are actually trying to troubleshoot slowness issues with Outlook as such. OFFCAT is an amazing tool
https://support.microsoft.com/en-au/help/2768656/outlook-performance-issues-when-there-are-too-many-items-or-folders-in
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Jimmy WangAuthor Commented:
Hi S_K_S, thanks for replying. the total is 500 folders for outlook 2010, 13 and 16 ?

with this link, it is related to cache mode, does it total number of folders can apply to online mode which is 500 folder limitation ?
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S_K_SCommented:
I could not find a MS Article yet however in the process came across this Article which I felt is worth sharing (https://danielkharman.wordpress.com/2016/09/10/revisiting-outlook-maximum-folder-limitations/).

Read this section carefully (Copy+Paste from the above link)
"But keep in mind that 500 folders is per profile and not per mailbox when talking about Outlook – therefore when diagnosing a user who has their own primary mailbox and access to three shared mailboxes, you do need to total the three shared mailboxes and the primary mailbox. You don’t need to include the archive mailboxes in Exchange Online because there are online and Outlook does not cache these."

This section explains Online Archive Mailbox is NOT cached and hence we may read it as If the Mailbox is in Online mode then the count is most probably not clubbed. However with Online Mode do expect slowness.
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Jackie ManIT ManagerCommented:
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Jackie ManIT ManagerCommented:
https://technet.microsoft.com/en-us/library/ff477612(v=exchg.141).aspx

The link above is the Technet article you want.

It is an Exchange server limit for max folders in cached mode.
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Jimmy WangAuthor Commented:
thanks S_K_S for this link https://danielkharman.wordpress.com/2016/09/10/revisiting-outlook-maximum-folder-limitations/.

so when you exceeded 500 folders, does this also will have performance issue with activesync ?



Let’s jump straight in. Exchange Online comes with a maximum number of subfolders per mailbox of 10,000. That is to say that each mailbox is has an absolute maximum number of folders that it can store of 10,000. Each of these 10,000 folders can store up to a maximum of 1,000,000 messages. The maximum mailbox hierarchy depth is 300. That means the total folder depth (think folder/subfolder/subfolder/sub…) can be 300 child folders long. These values are actually quite reasonable and suffice to say, any user who requires more folders or storage that this should be considering another solution


What about Outlook? Well, Outlook is a different beast altogether, and much unlike Exchange Online, is further limited by the hardware on which it is running on – (well, as is Exchange Online though I’m somewhat certain Microsoft’s hardware budget is a lot larger than say, yours). The magic number for Outlook 20xx is 500. If you have more than 500 folders in your profile, then you’re going to experience performance issues. What type of performance issues? Well, according to Microsoft in KB2768656, performance issues include:
 * Folders not displaying correctly
 * Performance issues (Hmmm…)
 * Outlook being very slow to open
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Jimmy WangAuthor Commented:
@Jackie Man.
thanks.. I think my issue is more on outlook online mode but the real problem encounter is activesync. that is why I'm looking for what is the outlook client folders support limits.
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Jackie ManIT ManagerCommented:
"Let’s jump straight in. Exchange Online comes with a maximum number of subfolders per mailbox of 10,000. That is to say that each mailbox is has an absolute maximum number of folders that it can store of 10,000. Each of these 10,000 folders can store up to a maximum of 1,000,000 messages. The maximum mailbox hierarchy depth is 300. That means the total folder depth (think folder/subfolder/subfolder/sub…) can be 300 child folders long. These values are actually quite reasonable and suffice to say, any user who requires more folders or storage that this should be considering another solution"

The above is a completely incorrect understanding.

Max folder view is 500 only in a mailbox profile and each folder can store 10,000 items, not folders. So, max items are 5,000,000 (5 millions) if you are using cached mode in MS Outlook.
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Jackie ManIT ManagerCommented:
"I think my issue is more on outlook online mode but the real problem encounter is activesync. that is why I'm looking for what is the outlook client folders support limits."

It is an Exchange server side limit not Outlook client side limit.

Outlook client side limit is on the file size of the OST file in cached mode. If you are using online mode, the limit is on your bandwidth to the Exchange server on accessing a large mailbox.
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Jimmy WangAuthor Commented:
@Jackie Man,
Thanks for clarify this..
isn't each folders can have 100,000 items not 10,000 ?

each mailbox limit is 500 folders..  so for the user that have over 3000 folders total, they would experience performance issue and activesync ? I'm more in concern with activesync because we do experience user iphone device keep doing full sync every week;2 or 3 times a week

everything is all pointing back to activesync full resync is too many folders. but I want to confirm this
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Jimmy WangAuthor Commented:
this is the link I found speaking about too many folders can cause activesync sync issue

https://support.appriver.com/kb/a787/synchronization-issues-due-to-folder-item-count.aspx
For Exchange 2010, ActiveSync synchronization issues may occur when folder item counts exceed the following limits:
•      Calendar – 10,000 items
•      Contacts – 10,000 items
•      Deleted items – 100,000 items
•      Inbox – 100,000 items
•      Sent items – 100,000 items
•      Other folders created by user – 100,000
 
Note: It does not matter how many days worth of e-mail a device is set to synchronize. ActiveSync has to scan the entire folder to determine which messages are within the range specified, so folders that exceed these limits can cause performance issues.

Max number of folders that can be synchronizied: 1,000
http://technet.microsoft.com/en-us/library/ee832791.aspx
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Jackie ManIT ManagerCommented:
True... and you need to upgrade to Outlook 2013 or 2016 to get a sync slider which limits the number of days to be synced.
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Jimmy WangAuthor Commented:
oh that is interesting..

let me ask you this way. for activesync device, does it matter what outlook version is running to synchronizing with less issue ?
this article is pretty much saying when folder reaches over to max 1000 you will experience activesync issue.

is the outlook client  version side or exchange 2010 server limitation ?
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Jackie ManIT ManagerCommented:
exchange 2010 server limitation ?

Yes. It is a server side limit if the client is using cached mode.
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Jackie ManIT ManagerCommented:
Max number of folders that can be synchronizied: 1,000

No. I cannot find the above.

The limit is on maximum folder viewable is 500.
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Jummy WangCommented:
Do you have the KB for folder view limit is 500 and is it related to activestnc syncing only ?
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Jackie ManIT ManagerCommented:
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S_K_SCommented:
Queries answered
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