Forum Discussion
Concurrency limits for shared mailboxes
Hi, We are considering converting distribution lists to shared mailboxes and adding them as an additional account (as described by VasilMichev in https://www.michev.info/Blog/Post/2025/how-to-add...
There is no official document available on the concurrent limit.
on Simultaneously open a shared mailbox, consider performance issue too, you can have as many as you want*, you just need to tweak the registry on the device
HKEY_CURRENT_USER\Software\Policies\Microsoft\Exchange
DWORD: MaxNumExchange
Outlook 2010 values: a decimal value between 1 and 15
Outlook 2013 values: a decimal value between 1 and 9999
Outlook 2016 values: a decimal value between 1 and 9999
Outlook 2019 values: a decimal value between 1 and 9999
on Simultaneously open a shared mailbox, consider performance issue too, you can have as many as you want*, you just need to tweak the registry on the device
HKEY_CURRENT_USER\Software\Policies\Microsoft\Exchange
DWORD: MaxNumExchange
Outlook 2010 values: a decimal value between 1 and 15
Outlook 2013 values: a decimal value between 1 and 9999
Outlook 2016 values: a decimal value between 1 and 9999
Outlook 2019 values: a decimal value between 1 and 9999
- Thank you!
The seeming lack of official documentation on the subject is what prompted my post. It also seems I have missed MaxNumExchange - thanks for the pointer!
