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Add to Outlook (Calendar and Contacts) Send/Receive Error
Problem reported by Michael Getz - 2/25/2021 at 11:30 PM
Submitted
When using the Add to Outlook Feature, some accounts after a variable period of time start to get Send/Receive errors showing:

Task 'SharePoint' reported error (0x80070005): You do not have permission to view this 
SharePoint List <name of the SharePoint list or library>. Contact the SharePoint site 
administrator. HTTP 302. 

Running SmarterMail Server Build 7593.  Client is Microsoft Outlook for Office 365 Version 2101 (Build 13628.20448.  No changes made on the server with respect to the user's account/passwords.

This occurs for Calendars, Contacts and Tasks.  Synchronization with the server stops when this occurs.  The only solution is to remove the Calendar, Contacts and Tasks and add them in again using "Add to Outlook"  This problematic however when the user has been adding calendar events, contacts and task to calendars no longer synchronizing.  A great deal of effort is required to determine which calendar events, contacts and tasks were created after the error - so they are not lost in the process.  

What causes this problem, and how do I permanently fix it?

Here is Microsoft's suggested resolution which is not a resolution [click here]    

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Douglas Foster Replied
SmarterMail support tells me that Microsoft has deprecated (i.e. abandoned) the Sharepoint protocol on which this depends, and as a result they are having a hard time giving it proper support.   Their suggestion is to switch to CalDav Synchronizer (which uses EWS) for IMAP clients, or MAPI.

1
Sébastien Riccio Replied
Hmm does caldav synchroniser really uses EWS ? I can't find any reference to this in their documentation or changelog about this.

My guess would be it uses... Dav (cal&card)
Sébastien Riccio
System & Network Admin

1
Gabriele Maoret - SERSIS Replied
Yes Sebastien, it uses CalDAV (as per name...) and NOT the EWS protocol...

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