Understanding the bottle neck of Shared Mailboxes, very high Exchange - Microsoft Community

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we continuously experience issues uses complaining shared mailboxes unresponsive or slow in outlook using o365.  typically not cached , running in online mode, first though network connectivity issues.  i've referenced technet article on several occasions i've not been able determine our cause.  technet link

pulling outlook connection test recent user avg proc , avg resp following:

mailbox   -   avg resp (4hr later)   -   avg proc (4hr later)

personal box   -   123 (176)   -   24 (37)

shared mailbox   -   2072 (1856)   -   31 (63)

there never large amount of fails, don't believe it's in relationship connection being lost. 

i'm curious next step in troubleshooting might be, i've read port exhaustion i'm not part of our networking team i'd provide them documentation in reference or proof.  there other tests can run in order diagnose cause of problem?  has been present shared mailboxes of sizes under 1gb 10+.

hi chris,

since using office 365 account in outlook, suggest use exchange cached mode instead of online mode. because online mode has tendency of network connectivity, mailbox size, server response, ect. exchange cached mode doesn’t have these restrictions or can understand perform better of online mode. 

more information, can refer https://support.office.com/en-us/article/turn-on-cached-exchange-mode-7885af08-9a60-4ec3-850a-e221c1ed0c1c.

regards,
alan


Office / Outlook / Windows other / Office 365 for business



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