Return
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Title
"Error: [270-24-26-80070057] Unable to open target mail store" -
Description
The following error was seen in the logs:
22:56:57 DEBUG: PstTgt::Logon - Opening session on profile '' as '\firstname.surname@subdomain.onmicrosoft.com'.
22:56:58 ERROR: [270-24-26-80070057] Unable to open target mail store
22:56:58 MAPILogonEx():
22:56:58 [80070057] The parameter is incorrect.
22:56:58 DEBUG: PstTgt::Logon returns 0 -
Cause
Missing Outlook profile in the Mail32 section of Windows -
Resolution
1- Create an Outlook profile
2- Verify Cache Mode is NOT enabled