Office 365 has limits using IMAP and SMTP. Outlook for mac)/OWA(Outlook on the web) user can have against an Exchange server at one time. Warning Microsoft will throttle all IMAP and SMTP connections per your contract. Get-OrganizationConfig | fl MapiHttpEnabledįor the three parameter RCAMaxConcurrency, EASMaxConcurrency, EwsMaxConcurrency and OwaMaxConcurrency, they are used to specifies how many concurrent connections an Exchange RPC(RPC client access service)/EAS(ActiveSync - Mobie device)/EWS(Exchange Web service, e.g. (If the value of CAS mailbox shows blank and the one of organization config shows True, or the value of CAS mailbox shows True, it represents that your mailbox is using MAPI over HTTP) Get-CASMailbox -Identity | fl MapiHttpEnabled Looking at the sign-ins report for this user we have confirmed the IPs that i see is his external IP but there is a lot of failures and interrupted. ![]() We have MFA deployed via a conditional access rule. I received a call today for one user that experience an excessive amount of MFA prompts. In the protocol column it shows "HTTP" everywhere., your mailboxes should use MAPI over HTTP for Outlook to access Exchange, you could try running the following commands to verify that: How to troubleshoot excessive MFA prompts. My question is: Are those the correct parameters I have to change? Which parameters should I change in such a use case? Am I missing anything?īased on your description having 20+ connections on a client. In the protocol column it shows "HTTP" everywhere.Īccording to microsofts documentation Set-ThrottlingPolicy increased RCAMaxConcurrency and EASMaxConcurrency for Outlook and EwsMaxConcurrency and OwaMaxConcurrency because of outlook connection status protocol column to a more reasonable limit for their case. Turning off the alerts here is an all or nothing solution, though. Click the 'OK' button to close the Options panel when youre done. ![]() You can turn any of the alerts on or off by checking or unchecking the corresponding boxes. Microsoft's hand-held computing software keeps improving, and the hardware. In Outlook connection status window I can see that for each mailbox delegation there is at least one new connection created, having 20+ connections on a client. Launch the Outlook application and then go to File > Options > Mail and scroll down to the 'Message Arrival' section. outlook is much brighter for the company's growing service businesses, which. The customers requirement is that each team member can access the mailboxes of the other team members using "full delegation".Īfter a quick search I ran into values I need to change in the throttling policy. At a customers site with 20+ employees per team I get an outlook warning message roughly translated to "The amount of elements opened at once has been limited by the server administrator".
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