Você deve verificar suas configurações de IMAPMaxConcurrency
para Set-ThrottlingPolicy
.
The IMAPMaxConcurrency parameter specifies how many concurrent connections an IMAP user can have against an Exchange server at one time. A connection is held from the moment a request is received until a response is sent in its entirety to the requestor. If users attempt to make more concurrent requests than their policy allows, the new connection attempt fails. However, the existing connections remain valid. The IMAPMaxConcurrency parameter has a valid range from 0 through 2147483647 inclusive. To indicate that the number of concurrent connections should be unthrottled (no limit), this value should be set to $null.