QB Issue Resolution:

The issue seems like it is being caused by an interruption of QuickBooks and the process that is used to communicate with Outlook, I suggest that you start by making sure that QuickBooks is up to date. It is possible that the software is still waiting for its turn to install an update, which could affect stability.

 

If that does not work for you, I recommend performing a clean install of QuickBooks on that workstation which will reinstall the link between QuickBooks and MS Office.

 

There are some brilliant minds among the members of this community, so be on the lookout for another suggestion.

Resolution for Issue 'Com Error when trying to send invoice via email' available: Yes (Solved).
Source: Intuit Community forum.

Com Error when trying to send invoice via email: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for invoice via
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Error Recovery for invoice via [Canada]
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