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Outlook error: 'error preparing to send sharing message'

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› Outlook › Outlook error: ‘error preparing to send sharing message’

Last reviewed on March 10, 2017     No Comments

When users try to send a sharing message after sharing the calendar with another user and they receive a message that there was an error preparing to send sharing message, you need to remove the delegates rule using MFCMapi. You'll need to use online mode with MFCMapi. (Disabling Cached mode should suffice.)

  1. Log in into the profile using Session, Logon
  2. Right-click on your account's message store and choose Open Store or Double-click on the account's message store to open it.
    open the message store
  3. Expand Root Container
  4. Expand Top of the information store
  5. Right-click on the Inbox folder and click Display Rules Table to see all the rules configured in the mailbox.

    right click on inbox to open the rules

  6. Scroll right to see the PR_RULE_PROVIDER column or scroll down in the lower section.
    find the rule
  7. Right-click on the Delegate Rule where "PR_RULE_PROVIDER" column property shows "Schedule+EMS Interface" and choose Delete
    right click to delete the rule

This removes all delegates and the user will need to re-add delegates.

This method can also be used to delete orphaned delegates from a mailbox.

More Information

Another sharing error is detailed at ""Folder sharing is not available…" error"

Outlook error: 'error preparing to send sharing message' was last modified: March 10th, 2017 by Diane Poremsky

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About Diane Poremsky

A Microsoft Outlook Most Valuable Professional (MVP) since 1999, Diane is the author of several books, including Outlook 2013 Absolute Beginners Book. She also created video training CDs and online training classes for Microsoft Outlook. You can find her helping people online in Outlook Forums as well as in the Microsoft Answers and TechNet forums.

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