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Search Results for: "microsoft 365"

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MailStore – EWS Error Code: “Requesting the OAuth2 token to access the mailbox has failed. Error: Keyset does not exist” when archive from Microsoft 365 mailboxes

Summary In MailStore, if you’re archiving from Microsoft 365 mailboxes, the following error occurs: “EWS Error Code: “Requesting the OAuth2 token to access the mailbox…  Read more

MailStore – “EWS Error Code: ErrorInvalidExchangeImpersonationHeaderData” when archive from Microsoft 365 mailboxes

Summary In MailStore, if you’re archiving from Microsoft 365 mailboxes, the following error occurs: “EWS Error Code: ErrorInvalidExchangeImpersonationHeaderData” This issue was reported in (but may…  Read more