Forum Discussion

Anonymous

Jan 15, 2018

What is the limit of Outlook clients connected to the same Exchange Account.

Hi, Does anybody know what the limit is of Outlook clients connected to the same Exchange Account? We have 2 Exchange Tenants (A & B). We have 20+ users from tenant A that want to add one and the...

exchange

Markus Strickler

Copper Contributor

Nov 14, 2018

Hi,

I was informed by Microsoft upon enquiring about the server-side thresholds, that the EWSMaxConcurrency is set to 27. This value also appears in this article https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fexchange%2Fclient-developer%2Fexchange-web-services%2Fews-throttling-in-exchange&data=02%7C01%7C%7C2e85e7a2740a4c18a61408d64a1d83c4%7Cf1ed0701294e404ca13bf81f707f845b%7C0%7C0%7C636777887968237303&sdata=rexm0zLZvAjbR%2FJ3m8auYbT57znOvVqyRz9b4Ue%2Bbo4%3D&reserved=0, and is set in each tenant's throttling policy.

Best regards,

Markus

Adam Ochs
Iron Contributor
Nov 14, 2018
As others have kind of pointed out here too, keep in mind every client/connection will add more, and reduce the number of connections you can have.

So if you have a user who sets up an account on his PC at work, Ipad, and phone, than they are likely taking up more than you realize. As the above response says, a good rule of thumb we found was roughly 4 connections per user, but if the user has multiple devices you cannot count on that being true.

We ultimately decided shared mailboxes etc were the way to go, and stopped trying to share user logins between systems.

Adam