How many shared mailboxes is too many in Exchange?

My organisation is running an Exchange 2010 environment with Outlook 2010. Due to a migration that occurred a few years back where several domains were rolled into one (4 domains using various email servers - Exchange 2000, Exchange 2003 and Domino) we have
ended up with many generic mailboxes and of course the staff who use them "need" them.
We have approx. 5000 staff all with standard user mailboxes and over 400 shared mailboxes. I have been told by a few people that this is far too many shared mailboxes for an organisation our size.
I'd really just like some tips, ideas and guidance on what the recommended amount of shared mailboxes should be.
Also any ideas on how to reduce this number by using some alternative methods would be much appreciate.

Hi,
Based on my knowledge, there is no official article to explain the recommended percentage of user mailboxes to shared mailboxes ratio.
As Gulab said, the number of shared mailboxes depends on your requirement. You just need to create suitable number of shared mailboxes for your company.
What's more, when people leave the company, we can disable or remove their mailboxes. Here are some threads for your reference.
Disable-Mailbox
http://technet.microsoft.com/en-us/library/aa997210(v=exchg.141).aspx
Remove a Mailbox
http://technet.microsoft.com/en-us/library/bb125192(v=exchg.141).aspx
Hope it helps.
If there are any problems, please feel free to let me know.
Best regards,
Amy
Amy Wang
TechNet Community Support

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Hi,
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Customers may exchange unwanted devices / accessories only once within 30 days from the date of purchase.
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Hi Shmaxolin,
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Hi Statik,
I find the solution from a similar thread. Information as below:
I found out that i have to use the registry for this:
DelegateSentItemsStyle, type REG_DWORD and set it to 1 (default is 0 or not present). HKCU\Software\Microsoft\Office\<version>\Outlook\Preferences
More details to see:
Where is Set-MailboxSentItemsConfiguration / Get-MailboxSentItemsConfiguration?
http://social.technet.microsoft.com/Forums/exchange/en-US/d1106ae3-1684-43c1-a831-4b7ef2e0c347/where-is-setmailboxsentitemsconfiguration-getmailboxsentitemsconfiguration?forum=exchangesvradmin
Hope it is helpful.
Thanks
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TechNet Community Support

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Dear all,
We have an server that runs Microsoft exchange server 2007 with the following specification:
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required for this migration<ins cite="mailto:Mohammad%20Ashouri" datetime="2014-05-18T22:41"></ins>?
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Hi every one.
Good evening
My question is, i have two databases in exchange 2010 server and i have around 150 mailboxes in both databases.
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pls see example.. this is just a example..i dont no how many are stored in each datbase :-(
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How many shared mailboxes is too many in Exchange?

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