Outlook/Exchange Syncing issue

I have a client that runs a small law firm.  There is one main lawyer with 4 support staff.  They are running a SBS2008 server with Office 2010 on the clients.  There is also 3 mobile devices in the picture.

Each support person has full access in to the main lawyers mailbox and open it as an addition mailbox in outlook 2010.  They store their communication messages in folders on the main lawyer's mailbox.  Subsequently there are a LOT of folders.  They main lawyer's mailbox is about 9 GB at this point.

The issue they are having is that, they are getting a lot of sync errors or finding that they things they have added to the lawyer's mailbox they can't see anymore.  If they were to use outlook web access it would be there.  This is not just with mail folders but with calendar folders as well.  

There is also an issue with the mobile devices staying synced as well.  We have to remove the account and add it back every few days.

I'm assuming the sync issues have to do with the fact that so many devices are pounding on the single mailbox at the same time. It has become a big problem keeping everything up to date.

My question is, am I correct about the sync problem being just a lot of collisions?  And, what would be a better approach to this scenario?

Thanks for your help.  Let me know if you need more information.
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CBSHQConnect With a Mentor Author Commented:
Well turning off cached mode did help some but the issues seems to be that there are more folders in that shared mailbox than the default allowed for a mapi session (which is 500).  I'm tring to get that limit increased but making the changes bellow don't seem to help as I'm still getting application event logs about the 500 folder limit

 Before editing the registry, back up any valuable data.
1.      Start Registry Editor (regedit).
2.      Locate the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem
3.      Right-click ParametersSystem, point to New, and then click Key.
4.      Type MaxObjsPerMapiSession, and then press ENTER to name the new subkey.
5.      Right-click MaxObjsPerMapiSession, click New, and then click DWORD Value.
6.      Type the object type, and then press ENTER to name the entry. For example, type objtFolder, and then press ENTER to create an entry that changes the default maximum of objtFolder objects.
7.      Right-click the entry that you created in Step 6, and then click Modify.
8.      In the Value data box, type the new maximum number of objects to which you want to limit this entry (such as 2000), and then click OK.

Now restart Outlook to check the result again.

I've contacted microsoft for assistance.
Just curious. Have you tried to turn off outlook cache mode ? Cache mode has caused issues for me in the past.

Also, make sure each client has all office patches and service packs.
WORKS2011Austin Tech CompanyCommented:
I don't believe it's correct analyzing this as collisions I've seen 15G mailboxes run fine, reset the switch since it's a single point of failure. Are you running a 1G network or 100M?
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CBSHQAuthor Commented:
I have not turned off cached mode but that is certainly an option.  They do have all the patches.

I'm sorry, I used "collisions" as a generic term, not in a network level way.  There are a lot of sync errors on serveral machines but they dont' give any real information on the cause of the conflict.
Simon Butler (Sembee)ConsultantCommented:
With that number of users, plus devices, the conflicts are probably just because multiple people are accessing the content. If there are no laptops involved, I would turn off cached mode and take the hit on the Exchange server performance wise. That should stop the conflicts because changes are made live, not locally then synchronised back.

CBSHQAuthor Commented:
There are some laptops involved but I'm able to eliminate 3 of the workstations since they are local, and switched them to non cached mode.  Let's see if this helps.
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